GBU-39 Small Diameter Bomb

File:Boeing GBU-39 Small Diameter Bomb.jpg

The original SDB is equipped with a GPS-aided inertial navigation system to attack fixed/stationary targets such as fuel depots, bunkers, etc. The second variant, Raytheon's GBU-53/B SDB II, will include a thermal seeker and radar with automatic target recognition features for striking mobile targets such as tanks, vehicles, and mobile command posts.{{Cite web |date=12 October 2009 |title=Boeing Small Diameter Bomb II Successfully Engages Target in Flight Test |url=https://boeing.mediaroom.com/2009-10-12-Boeing-Small-Diameter-Bomb-II-Successfully-Engages-Target-in-Flight-Test |url-status=live |archive-url=https://web.archive.org/web/20230929141222/https://boeing.mediaroom.com/2009-10-12-Boeing-Small-Diameter-Bomb-II-Successfully-Engages-Target-in-Flight-Test |archive-date=29 September 2023 |website=Boeing}}

The small size of the bomb allows a single-strike aircraft to carry more of them than previously available bombs, and thus strike more targets. The SDB carries approximately {{convert|36|lb|kg|0|abbr=on}} of AFX-757 high explosive.{{Cite web |title=Boeing GBU-39/B SDB |url=https://aviationsmilitaires.net/v3/kb/externalload/show/1149/boeing-gbu-39b-sdb |language=fr |url-status=live |archive-url= https://web.archive.org/web/20230406183738/https://aviationsmilitaires.net/v3/kb/externalload/show/1149/boeing-gbu-39b-sdb |archive-date=6 April 2023 |website=AviationsMilitaires.net}} AFX-757 is an insensitive enhanced blast polymer-bonded explosive, containing 25% RDX high explosive, 30% ammonium perchlorate oxidizer, 33% aluminium powder, 4.44% HTPB binder and 6.56% dioctyl adipate plasticizer.{{cite patent|country=US|status=patent|number=6523477B1|title=Enhanced Performance Insensitive Penetrator Warhead|invent1=George W. Brooks|invent2=Eric E. Roach|assign=Lockheed Martin Corporation|gdate=2003-02-25|url=https://patents.google.com/patent/US6523477B1/en}} AFX-757 has improved air blast equivalent, 1.39 times more than Composition B, but low brisance due to low RDX content.{{cite journal |doi=10.1002/prep.202100195 |title=Aluminized Enhanced Blast Explosive Based on Polysiloxane Binder |date=2022 |last1=Kolev |first1=Stefan K. |last2=Tsonev |first2=Tsvetomir T. |journal=Propellants, Explosives, Pyrotechnics |volume=47 |issue=2 |s2cid=244902961 }} It has integrated "DiamondBack" type wings which deploy after release, increasing the glide time and therefore the maximum range. Its size and accuracy allow for an effective munition with less collateral damage.{{Cite web |title=GBU-39 Small Diameter Bomb / Small Smart Bomb |url=https://www.globalsecurity.org/military/systems/munitions/sdb.htm |url-status=live |archive-url=https://web.archive.org/web/20230915122201/https://www.globalsecurity.org/military/systems/munitions/sdb.htm |archive-date=15 September 2023 |website=Global Security}} Warhead penetration is {{cvt|1|m|ft|order=flip|sigfig=1}} of steel reinforced concrete under {{cvt|1|m|ft|order=flip|sigfig=1}} of earth and the fuze has electronic safe and fire (ESAF) cockpit selectable functions, including air burst and delayed options.

The SDB I has a circular error probable (CEP) precision of {{cvt|1|m|ft|order=flip|sigfig=1}}. CEP is reduced by updating differential GPS offsets prior to weapon release. These offsets are calculated using an SDB Accuracy Support Infrastructure, consisting of three or more GPS receivers at fixed locations transmitting calculated location to a correlation station at the theatre Air Operations Center. The corrections are then transmitted by Link 16 to SDB-equipped aircraft.

In November 2014, the U.S. Air Force began the development of a version of the SDB I intended to track and attack sources of electronic warfare jamming directed to disrupt the munitions' guidance. The home-on-GPS jam (HOG-J) seeker works similar to the AGM-88 HARM to follow the source of a radio-frequency jammer to destroy it.{{Cite web |last=Keller |first=John |date=13 November 2014 |title=Air Force to enable smart weapons to track and kill sources of electronic warfare (EW) jamming |url=https://www.militaryaerospace.com/rf-analog/article/16718805/air-force-to-enable-smart-weapons-to-track-and-kill-sources-of-electronic-warfare-ew-jamming |url-status=live |archive-url=https://web.archive.org/web/20230209113002/https://www.militaryaerospace.com/rf-analog/article/16718805/air-force-to-enable-smart-weapons-to-track-and-kill-sources-of-electronic-warfare-ew-jamming |archive-date=9 February 2023 |website=Military Aerospace}}{{Cite web |last=Gould |first=Joe |date=31 May 2015 |title=Guided-Bomb Makers Anticipate GPS Jammers |url=https://www.defensenews.com/air/2015/05/31/guided-bomb-makers-anticipate-gps-jammers/ |url-status=live |archive-url=https://archive.today/20240108205733/https://www.defensenews.com/air/2015/05/31/guided-bomb-makers-anticipate-gps-jammers/ |archive-date=8 January 2024 |website=Defense News}}

In January 2016, the Air Force awarded a contract to Scientific Systems Co. Inc. to demonstrate the company's ImageNav technology, a vision-based navigation and precision targeting system that compares a terrain database with the host platform's sensor to make course corrections. ImageNav technology has demonstrated target geo-location and navigation precision within three meters.{{Cite web |last=Keller |first=John |date=14 January 2016 |title=Air Force tests technology that could enable smart munition to see the way to its target |url=https://www.militaryaerospace.com/computers/article/16714636/air-force-tests-technology-that-could-enable-smart-munition-to-see-the-way-to-its-target |url-status=live |archive-url=https://web.archive.org/web/20221226014446/https://www.militaryaerospace.com/computers/article/16714636/air-force-tests-technology-that-could-enable-smart-munition-to-see-the-way-to-its-target |archive-date=26 December 2022 |website=Military Aerospace}}

In January 2016, Orbital ATK revealed that the Alternative Warhead (AW), designed for the M270's GMLRS to achieve area effects without leaving behind unexploded ordnance, had been successfully tested on the SDB.{{Cite web |date=20 January 2016 |title=Lockheed Martin awarded Orbital ATK to produce its GMLRS Alternative Warhead for US Army |url=https://armyrecognition.com/january_2016_global_defense_security_news_industry/lockheed_martin_awarded_orbital_atk_to_produce_its_gmlrs_alternative_warhead_for_us_army_32001164.html |url-status=live |archive-url=https://web.archive.org/web/20230408140116/https://armyrecognition.com/january_2016_global_defense_security_news_industry/lockheed_martin_awarded_orbital_atk_to_produce_its_gmlrs_alternative_warhead_for_us_army_32001164.html |archive-date=8 April 2023 |website=Army Recognition}}

In 2002, while Boeing and Lockheed Martin were competing to develop the Small Diameter Bomb, Darleen A. Druyun – at that time Principal Deputy Assistant Secretary of the Air Force for Acquisition and Management – deleted the requirement for moving target engagement, which favored Boeing. She was later convicted of violating a conflict of interest statute.{{Cite web |title=GBU-40 Small Diameter Bomb II (SDB II) |url= https://www.globalsecurity.org/military/systems/munitions/gbu-40.htm |url-status=live |archive-url= https://web.archive.org/web/20230409041716/https://www.globalsecurity.org/military/systems/munitions/gbu-40.htm |archive-date=9 April 2023 |website=Global Security}}{{Cite web |title=Comptroller General of the United States on Lockheed Martin Corporation--Costs |url=http://www.gao.gov/decisions/bidpro/2954022.pdf |url-status=dead |archive-url=https://web.archive.org/web/20100808013131/http://www.gao.gov/decisions/bidpro/2954022.pdf |archive-date=8 August 2010 |access-date=23 August 2010 |website=U.S. Government Accountability Office}}

In May 2009, Raytheon announced that it had completed its first test flight of the GBU-53/B Small Diameter Bomb II, which has a data link and a tri-mode seeker built with technology developed for the Precision Attack Missile.{{Cite web |date=28 April 2009 |title=Raytheon's GBU-53/B Small Diameter Bomb II Completes First Control Test Vehicle Flight |url=https://raytheon.mediaroom.com/index.php?s=43&item=1253 |url-status=live |archive-url=https://web.archive.org/web/20221201063640/https://raytheon.mediaroom.com/index.php?s=43&item=1253 |archive-date=1 December 2022 |website=Raytheon}} In August 2010 the U.S. Air Force awarded a $450 million contract for engineering and development.{{Cite web |date=10 August 2010 |title=Air Force picks small diameter bomb |url=https://www.upi.com/Defense-News/2010/08/10/Air-Force-picks-small-diameter-bomb/45261281448787/ |url-status=live |archive-url=https://web.archive.org/web/20211110064025/https://www.upi.com/Defense-News/2010/08/10/Air-Force-picks-small-diameter-bomb/45261281448787/ |archive-date=10 November 2021 |website=UPI}}

Although unit costs were somewhat uncertain as of 2006, the estimated cost for the INS/GPS version was around US$70,000. Boeing and the Italian firm Oto Melara signed a contract covering the license production of 500 GBU-39/B (INS/GPS) and 50 BRU-61/A racks for the Aeronautica Militare, at a cost of nearly US$34 million.

• October 2001 – Boeing is awarded an SDB development contract in addition to Lockheed Martin to compete to become the prime contractor.{{Cite web |date=3 October 2001 |title=Boeing Awarded Small Diameter Bomb Contract |url=http://www.boeing.com/defense-space/missiles/sdb/news/2001/q4/nr_011003b.html |url-status=dead |archive-url=https://web.archive.org/web/20080610003125/http://www.boeing.com/defense-space/missiles/sdb/news/2001/q4/nr_011003b.html |archive-date=10 June 2008 |website=Boeing}}
• 2003 - was already described as possible munition on the battlefield at the specialized press{{cite web | url=https://books.google.com/books?id=Pd-5AAAAIAAJ&dq=ATACMS+submarines&pg=PP407 | title=Jane's International Defense Review: IDR | date=2003 }}
• April 2005 – Boeing awarded the contract as Prime Contractor, beating Lockheed Martin.{{Cite web |date=25 April 2005 |title=Small Diameter Bomb Increment I Initial Production Contract Awarded |url=https://www.af.mil/News/Article-Display/Article/140931/small-diameter-bomb-increment-i-initial-production-contract-awarded/ |url-status=live |archive-url=https://web.archive.org/web/20231018165319/https://www.af.mil/News/Article-Display/Article/140931/small-diameter-bomb-increment-i-initial-production-contract-awarded/ |archive-date=18 October 2023 |access-date=19 September 2023 |website=U.S. Air Force |language=en-US}}
• September 2005 – Small Diameter Bomb certified for operational test, and evaluation.{{Cite web |last=Ruscetta |first=Louis |date=30 September 2005 |title=Small Diameter Bomb certified for operational test, evaluation |url=https://www.af.mil/News/Article-Display/Article/133196/small-diameter-bomb-certified-for-operational-test-evaluation/ |url-status=live |archive-url=https://web.archive.org/web/20240108211618/http://www.af.mil/News/Article-Display/Article/133196/small-diameter-bomb-certified-for-operational-test-evaluation/ |archive-date=8 January 2024 |website=U.S. Air Force}}
• September 2006 – The SDB team delivered the first SDBs to the USAF.{{Cite web |date=6 September 2006 |title=Small Diameter Bomb I delivered ahead of schedule |url=https://www.af.mil/News/Article-Display/Article/129880/small-diameter-bomb-i-delivered-ahead-of-schedule/ |url-status=live |archive-url=https://web.archive.org/web/20240108212100/https://www.af.mil/News/Article-Display/Article/129880/small-diameter-bomb-i-delivered-ahead-of-schedule/ |archive-date=8 January 2024 |website=U.S. Air Force}}
• October 2006 – Initial Operational Capability declared for SDB on the F-15E Strike Eagle.{{Cite web |last=Wicke |first=Russel |date=5 October 2006 |title=ACC declares IOC for Small Diameter Bomb – Air Combat Command |url=https://www.af.mil/News/Article-Display/Article/129512/acc-declares-small-diameter-bomb-initially-operational/ |url-status=live |archive-url=https://web.archive.org/web/20240108211802/https://www.af.mil/News/Article-Display/Article/129512/acc-declares-small-diameter-bomb-initially-operational/ |archive-date=8 January 2024 |access-date= |website=U.S. Air Force}}
• October 2006 – First use in combat.
• February 2008 – 1,000th SDB I and first 50 FLM delivered.{{Cite web |date=28 February 2008 |title=Boeing Celebrates Small Diameter Bomb Delivery Milestones |url=https://boeing.mediaroom.com/2008-02-28-Boeing-Celebrates-Small-Diameter-Bomb-Delivery-Milestones |url-status=live |archive-url=https://web.archive.org/web/20230408172257/https://boeing.mediaroom.com/2008-02-28-Boeing-Celebrates-Small-Diameter-Bomb-Delivery-Milestones |archive-date=8 April 2023 |website=Boeing}}
• September 2008 – Israel received approval from the US Congress to purchase 1,000 bombs.
• December 2008 – Reportedly used against Hamas facilities in the Gaza Strip, including underground rocket launchers.{{cite news |last=Katz |first=Yaakov |date=29 December 2008 |title=IAF uses new US-supplied smart bomb |url=http://fr.jpost.com/servlet/Satellite?cid=1230456505080&pagename=JPost/JPArticle/ShowFull |url-status=dead |archive-url=https://web.archive.org/web/20110713122818/http://fr.jpost.com/servlet/Satellite?cid=1230456505080&pagename=JPost%2FJPArticle%2FShowFull |archive-date=13 July 2011 |access-date=29 December 2008 |work=The Jerusalem Post}}
• January 2009 – Unnamed Boeing official stated that they have yet to deliver any SDBs to Israel.{{cite web|last=Butler|first=Amy|title=Mystery SDB|url=http://www.aviationweek.com/aw/blogs/defense/index.jsp?plckController=Blog&plckScript=blogScript&plckElementId=blogDest&plckBlogPage=BlogViewPost&plckPostId=Blog%3a27ec4a53-dcc8-42d0-bd3a-01329aef79a7Post%3a5095496d-eed1-4997-a61d-bb76a1a1dbaa|work=Ares Blog|publisher=Aviation Week|access-date=23 December 2011|date=2009-01-16}}{{Dead link|date=May 2024 |bot=InternetArchiveBot |fix-attempted=yes }}
• June 2010 – FMS request by the Netherlands for 603 units and support equipment valued at US$44 million.{{cite web |date=27 July 2010 |title=The Netherlands – GBU-39 Small Diameter Bombs |url=http://www.dsca.mil/major-arms-sales/netherlands-gbu-39-small-diameter-bombs |url-status=live |archive-url=https://web.archive.org/web/20231018165321/https://www.dsca.mil/press-media/major-arms-sales/netherlands-gbu-39-small-diameter-bombs |archive-date=18 October 2023 |access-date=16 April 2016 |website=Defense Security Cooperation Agency}}
• August 2010 – U.S. Air Force selects Raytheon over Boeing for the GBU-53/B for Small Diameter Bomb II Program.{{Cite web |date=9 August 2010 |title=U.S. Air Force Selects Raytheon's GBU-53/B for Small Diameter Bomb II Program |url=https://www.prnewswire.com/news-releases/us-air-force-selects-raytheons-gbu-53b-for-small-diameter-bomb-ii-program-100299564.html |archive-url=https://web.archive.org/web/20240108213320/https://www.prnewswire.com/news-releases/us-air-force-selects-raytheons-gbu-53b-for-small-diameter-bomb-ii-program-100299564.html |archive-date=8 January 2024 |website=PR Newswire |publisher=Raytheon}}
• 2011 – Boeing begins the development of Laser SDB I, utilizing the same laser from the Laser JDAM to keep costs down.{{Cite web |last=Weisgerber |first=Marcus |date=9 August 2012 |title=Boeing: Laser Small Diameter Bomb Could Fill Gap |url=http://www.defensenews.com/article/20120809/DEFREG02/308090001/Boeing-Laser-Small-Diameter-Bomb-Could-Fill-Gap |url-status=dead |archive-url=https://archive.today/20140527172718/http://www.defensenews.com/article/20120809/DEFREG02/308090001/Boeing-Laser-Small-Diameter-Bomb-Could-Fill-Gap |archive-date=27 May 2014 |website=Defense News}}
• 2014 – Work begins on home-on-GPS jam.
• 2014 – U.S. Special Operations Command began fielding the Laser SDB.
• April 2016 – FMS request by Australia for 2,950 units and support equipment valued at US$386 million.{{cite web |date=6 April 2016 |title=Australia – GBU-39 (Small Diameter Bomb Increment I) |url=http://www.dsca.mil/major-arms-sales/australia-gbu-39-small-diameter-bomb-increment-i |url-status=live |archive-url=https://web.archive.org/web/20230702035730/https://www.dsca.mil/press-media/major-arms-sales/australia-gbu-39-small-diameter-bomb-increment-i |archive-date=2 July 2023 |access-date=16 April 2016 |website=Defense Security Cooperation Agency}}

The GBU-39/B began separation tests on the F-22 Raptor in early September 2007, after more than a year of sometimes difficult work to integrate the weapon in the weapons bay and carry out airborne captive carry tests.

The SDB is integrated on the F-15E Strike Eagle, Panavia Tornado, JAS-39 Gripen, F-16 Fighting Falcon, F-22 Raptor and AC-130W. Future integration is planned for the F-35 Lightning II, A-10 Thunderbolt II, B-1 Lancer, B-2 Spirit, B-52 Stratofortress and AC-130J. Other aircraft, including UCAVs, may also receive the necessary upgrades. The General Atomics MQ-20 Avenger is also planned to carry the weapon.{{Cite web|title=Predator C Avenger UAV Great War Machine 2013|url=https://www.youtube.com/watch?v=0ofIRiXb-90|url-status=dead|date=6 June 2013|archive-url=https://web.archive.org/web/20131103170411/http://www.youtube.com/watch?v=0ofIRiXb-90|website=YouTube|archive-date=3 November 2013}} [YouTube link is archived, but video itself is not available.]

Evidence appeared in May 2024 that Ukraine has modified MiG-29AS fighters to carry eight GBU-39/B.{{Cite web |date=2024-05-25 |title=Ukrainian fighter jets receive GBU-39 bombs — high-precision, powerful, inexpensive |url=https://itc.ua/en/news/ukrainian-fighter-jets-receive-gbu-39-bombs-high-precision-powerful-inexpensive/ |access-date=2024-05-26 |website=ITC.ua}} The Ukrainian Air Force has used air-dropped Small Diameter Bombs since November 2023. The air-dropped Small Diameter Bomb "has proved resilient to jamming” and has a “nearly 90 percent" accuracy rate. Previously Ukraine had operated the GLSDB ground-launched version of the Small Diameter Bomb, which was regarded "ineffective" due to Russian jamming. They are also harder to intercept due to their small size.{{cite news |title=Ukraine Situation Report: Kyiv Says It's Using Air-Launched Small Diameter Bombs |url=https://www.twz.com/news-features/ukraine-situation-report-kyiv-says-its-using-air-launched-small-diameter-bombs |access-date=27 May 2024 |work=TWZ|first=Thomas |last=Newdick |date=24 May 2024 |language=en}} This small size, combined with being air-launched, means that the SDB might hit a target before Russian electronic warfare can jam the weapon. The GLSDB has a "parabolic flight path" of artillery fire that can be detected on radar.{{cite news |title=US-made GBU-39 SDB Glide Bomb is Beating Russian Jamming In Ukraine |url=https://theaviationist.com/2024/05/25/gbu-39-sdb-glide-bomb-in-ukraine/ |access-date=27 May 2024 |work=The Aviationist|first=Parth |last=Satam |date=25 May 2024 |language=en}}

Under a contract awarded in September 2006, Boeing developed a version of the SDB I that replaces the steel casing with a lightweight composite casing and the warhead with a focused-blast explosive such as dense inert metal explosive (DIME). This should further reduce collateral damage when using the weapon for pinpoint strikes in urban areas. The USAF intends to use the same FLM casing on a weapon of {{convert|500|lb|kg|0}}.{{Cite web|url=https://aviationweek.com/usaf-eyes-low-yield-munitions |title=USAF Eyes Low-Yield Munitions |website=Aviation Week |date=23 April 2010}} Boeing celebrated the delivery of the first 50 FLM weapons on 28 February 2008 and delivered the last of the 500 FLMs under contract in December 2013.{{Cite web |date=19 December 2013 |title=Boeing Delivers Final Focused Lethality Munition to US Air Force |url=https://boeing.mediaroom.com/Boeing-Delivers-Final-Focused-Lethality-Munition-to-US-Air-Force |url-status=live |archive-url=https://web.archive.org/web/20230325045703/https://boeing.mediaroom.com/Boeing-Delivers-Final-Focused-Lethality-Munition-to-US-Air-Force |archive-date=25 March 2023 |website=Boeing}}

In 2011 Boeing began testing on a laser-guided version of the baseline SDB, integrating the same Semi Active Laser (SAL) from the GBU-54 Laser JDAM. Boeing claimed to have successfully hit targets moving at {{Convert|30|mph|km/h|1|abbr=on}} and {{Convert|50|mph|km/h|1|abbr=on}}.

In mid-2012, the U.S. Senate recommended zeroing out funding for the GBU-53/B SDB II due to fielding delays with the F-35 Lightning II. Commenting on the delay of the SDB II, Debbie Rub, Boeing's VP & GM of Missiles and Unmanned Airborne Systems said, “Until that [SDB II] comes online … this is a nice gap filler to take care of an important warfighting need," stating that Boeing could fill the gap in capability at a fraction of the cost; "As we think about the fiscal constraints that we’re under and DoD is under, it’s the right kind of answer where you get an 80 percent solution at a fraction of the cost.”

In June 2013, Boeing secured a contract for the development and testing of the LSDB. Under the contract Boeing was to provide engineering, integration test, and production support, plus the development of an LSDB Weapon Simulator. According to Boeing, the LSDB can be constructed at a more economical cost compared to the planned Raytheon GBU-53/B SDB II, leveraging the same semi-active laser sensor as the JDAM to effectively target moving and maritime targets. However, Boeing admitted to a capability gap in the ability to engage targets in zero-visibility weather, lacking the millimeter wave radar of the GBU-53/B SDB II.{{Cite web |last=Majumdar |first=Dave |date=28 June 2013 |title=USAF to award Boeing Laser SDB contract |url=https://www.flightglobal.com/usaf-to-award-boeing-laser-sdb-contract/110373.article |url-status=dead |archive-url=https://web.archive.org/web/20201205152018/https://www.flightglobal.com/usaf-to-award-boeing-laser-sdb-contract/110373.article |archive-date=5 December 2020 |website=FlightGlobal}} In 2014, U.S. Special Operations Command began fielding the Laser SDB.{{Cite web |last=Harper |first=Jon |date=1 July 2015 |title=Surveillance Technology a Priority For Special Operations Forces |url=https://www.nationaldefensemagazine.org/articles/2015/7/1/2015july-surveillance-technology-a-priority-for-special-operations-forces |url-status=live |archive-url=https://web.archive.org/web/20230928111830/https://www.nationaldefensemagazine.org/articles/2015/7/1/2015july-surveillance-technology-a-priority-for-special-operations-forces |archive-date=28 September 2023 |website=National Defense Magazine}}{{Cite web |date=8 November 2019 |title=USAF's Laser-SDB Contract Goes to Boeing |url=https://www.indrastra.com/2019/11/USAF-s-Laser-SDB-Contract-Boeing-005-11-2019-0052.html |url-status=live |archive-url=https://web.archive.org/web/20230320213812/https://www.indrastra.com/2019/11/USAF-s-Laser-SDB-Contract-Boeing-005-11-2019-0052.html |archive-date=20 March 2023 |access-date=11 November 2023 |website=IndraStra Global |language=en}}

{{main|Ground Launched Small Diameter Bomb}}

It was reported that Israel used a GBU-39/B SDB during the strike that killed 45 civilians in a Rafah refugee tent camp on May 26, 2024.{{Cite news |last1=Stein |first1=Robin |last2=Triebert |first2=Christiaan |last3=Willis |first3=Haley |date=2024-05-29 |title=Israel Used U.S.-Made Bombs in Strike That Killed Dozens in Rafah |url=https://www.nytimes.com/2024/05/29/world/middleeast/israel-us-rafah-bombs.html |access-date=2024-07-05 |work=The New York Times |language=en-US |issn=0362-4331}} Defense experts stated that Israel had better options to turn to than the GBU-39 when civilians were nearby.{{Cite web |date=2024-05-30 |title=Israel could have used smaller weapons against Hamas to avoid deaths in Gaza tent fire, experts say |url=https://apnews.com/article/bomb-rafah-civilians-israel-us-ada219d17926a14ca8c179338d53d109 |access-date=2024-11-29 |website=AP News |language=en}} According to CNN, Israel also used a GBU-39/B SDB in a strike at the gate of the Al-Mutanabbi school complex near Khan Younis in Southern Gaza, which was being used to house displaced people. The IDF stated that the strike was targeted against a Hamas operative, while the Palestinian Ministry of Health reported at least 27 killed and 53 injured in the strike.{{cite web | url=https://www.cnn.com/2024/07/10/middleeast/israel-us-munitions-school-strike-khan-younis-intl-latam/index.html | title=US-made munitions used in a deadly Israeli strike on school complex near Khan Younis, CNN analysis finds | website=CNN | date=10 July 2024 }} In August 2024, CNN reported that Israel used the GBU/39 again in the Al-Tabaeen school attack, killing over 90 people according to the Gaza Civil Defense. The IDF stated that it was a precision strike against a Hamas command and control center that killed at least 19 Hamas and Islamic Jihad terrorists.{{Cite web |first1=Lex |last1=Harvey |first2=Irene |last2=Nasser |first3=Mohammed |last3=Tawfeeq |first4=Allegra |last4=Goodwin|date=2024-08-10 |title=Israeli strike on mosque and school in Gaza kills scores, sparking international outrage |url=https://edition.cnn.com/2024/08/10/middleeast/israeli-school-strike-gaza-intl-hnk/index.html |access-date=2024-08-17 |website=CNN |language=en |archive-url=https://web.archive.org/web/20240816010800/https://edition.cnn.com/2024/08/10/middleeast/israeli-school-strike-gaza-intl-hnk/index.html |archive-date=2024-08-16}}

• {{AUS}}: Foreign Military Sale of up to 2,950 GBU-39 (SDB 1), and 50 Guided Test Vehicles with GBU-39 (T-1)/B (Inert Fuze) for an est. cost of $386 million was approved in April 2016, with bombs delivered to RAAF in 2019.{{Cite web |date=23 August 2019 |title=RAAF F-35As receive small diameter bombs - Australian Defence Magazine |url=https://www.australiandefence.com.au/news/raaf-f-35as-receive-small-diameter-bombs |url-status=live |archive-url=https://web.archive.org/web/20231018165323/https://www.australiandefence.com.au/news/raaf-f-35as-receive-small-diameter-bombs |archive-date=18 October 2023 |access-date=19 September 2023 |website=Australian Defence Magazine |language=en}}
• {{ISR}}: In 2012 Israel purchased munitions from the United States at a total value of $1.879 billion, which included 3,450 GBU-39/B (SDB 1),{{Cite web |date=31 December 2012 |title=36(b)(1) Arms Sales Notification - GBU-39 Israel |url=https://www.federalregister.gov/documents/2012/12/31/2012-31429/36b1-arms-sales-notification |url-status=live |archive-url=https://archive.today/20240108215425/https://www.federalregister.gov/documents/2012/12/31/2012-31429/36b1-arms-sales-notification |archive-date=8 January 2024 |access-date=2 July 2023 |website=Federal Register}}{{Cite web |date=20 December 2012 |title=Israel – Munitions |url=https://www.dsca.mil/press-media/major-arms-sales/israel-munitions |url-status=live |archive-url=https://web.archive.org/web/20231212090335/https://www.dsca.mil/press-media/major-arms-sales/israel-munitions |archive-date=12 December 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}} plus 4,100 GBU-39/B purchased in 2015 as part of another munitions purchase.{{Cite web |date=3 June 2015 |title=36(b)(1) Arms Sales Notification - GBU-39 Israel |url=https://www.federalregister.gov/documents/2015/06/03/2015-13478/36b1-arms-sales-notification |url-status= |archive-url= |archive-date= |access-date=2 July 2023 |website=Federal Register}}{{Cite web |date=19 May 2015 |title=Israel – Joint Direct Attack Munition Tail Kits and Munitions |url=https://www.dsca.mil/press-media/major-arms-sales/israel-joint-direct-attack-munition-tail-kits-and-munitions |url-status=live |archive-url=https://web.archive.org/web/20231108015805/https://www.dsca.mil/press-media/major-arms-sales/israel-joint-direct-attack-munition-tail-kits-and-munitions |archive-date=8 November 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}}
• {{ITA}}: In 2010 Italian company OTO Melara signed a $34 million contract with Boeing to manufacture the SDB-1 for the Italian Air Force.{{Cite web |date=19 January 2010 |title=Boeing, Oto Melara Sign Contract for SDB Co-production in Italy |url=https://boeing.mediaroom.com/news-releases-statements?item=1036 |url-status=live |archive-url=https://web.archive.org/web/20231018165322/https://boeing.mediaroom.com/news-releases-statements?item=1036 |archive-date=18 October 2023 |access-date=19 September 2023 |website=Boeing}}
• {{NLD}}: In 2010 the Netherlands purchased 603 GBU-39 (SDB 1) for an estimated cost of $44 million.
• {{SAU}}: In October 2013, Saudi Arabia purchased various munitions from the US, including 1,000 GBU-39 (SDB 1).{{Cite web |date=15 October 2013 |title=Saudi Arabia - Various Munitions and Support |url=https://www.dsca.mil/press-media/major-arms-sales/saudi-arabia-various-munitions-and-support |url-status=live |archive-url=https://web.archive.org/web/20230702035729/https://www.dsca.mil/press-media/major-arms-sales/saudi-arabia-various-munitions-and-support |archive-date=2 July 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}} In Dec 2020 a request to purchase 3,000 GBU-39 (SDB 1) was approved by the US Government.{{Cite web |date=29 December 2020 |title=Saudi Arabia – GBU-39 Small Diameter Bomb I (SDB I) Munitions |url=https://www.dsca.mil/press-media/major-arms-sales/saudi-arabia-gbu-39-small-diameter-bomb-i-sdb-i-munitions |url-status=live |archive-url=https://web.archive.org/web/20231006220918/https://www.dsca.mil/press-media/major-arms-sales/saudi-arabia-gbu-39-small-diameter-bomb-i-sdb-i-munitions |archive-date=6 October 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}}{{Cite news |last=Stone |first=Mike |date=29 December 2020 |title=CORRECTED-U.S. State Department approves potential sale of 3,000 smart bombs to Saudi Arabia |url=https://www.reuters.com/article/usa-saudi-arms-idCNL1N2J91NB |url-status=dead |archive-url=https://web.archive.org/web/20201230191017/https://www.reuters.com/article/usa-saudi-arms-idCNL1N2J91NB |archive-date=30 December 2020 |access-date=2 July 2023 |work=Reuters |language=en}}
• {{KOR}}: In 2013 South Korea made two purchases of the GBU-39, as part of a purchase of weapons for F-15 SE including 542 GBU-39/B{{Cite web |date=28 May 2013 |title=36(b)(1) Arms Sales Notification - GBU-39 Republic of Korea ($793 million) |url=https://www.federalregister.gov/documents/2013/05/28/2013-12563/36b1-arms-sales-notification |access-date=2 July 2023 |website=Federal Register}}{{Cite web |date=22 May 2013 |title=Republic of Korea – F-15SE Aircraft Weapons |url=https://www.dsca.mil/press-media/major-arms-sales/republic-korea-f-15se-aircraft-weapons |url-status=live |archive-url=https://web.archive.org/web/20230702074215/https://www.dsca.mil/press-media/major-arms-sales/republic-korea-f-15se-aircraft-weapons |archive-date=2 July 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}} and weapons for the F-35 aircraft, of another 542 GBU-39/B.{{Cite web |date=28 May 2013 |title=36(b)(1) Arms Sales Notification - GBU-39 Republic of Korea ($823 Million) |url=https://www.federalregister.gov/documents/2013/05/28/2013-12562/36b1-arms-sales-notification |access-date=2 July 2023 |website=Federal Register}}{{Cite web |date=22 May 2013 |title=Republic of Korea – F-35 Aircraft Weapons |url=https://www.dsca.mil/press-media/major-arms-sales/republic-korea-f-35-aircraft-weapons |url-status=live |archive-url=https://web.archive.org/web/20230702100113/https://www.dsca.mil/press-media/major-arms-sales/republic-korea-f-35-aircraft-weapons |archive-date=2 July 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}}
• {{SWE}}: In 2019, Sweden ordered the GBU-39, to be deployed from the JAS 39 Gripen.{{Cite web |title=Contracts for April 15, 2019 |url=https://www.defense.gov/News/Contracts/Contract/Article/1814812/ |url-status=live |archive-url=https://web.archive.org/web/20230903042659/https://www.defense.gov/News/Contracts/Contract/Article/1814812// |archive-date=3 September 2023 |access-date=19 September 2023 |website=U.S. Department of Defense |language=en-US}}
• {{UKR}}: Ukrainian Air Force{{Cite web |title=Ukraine reportedly uses GLSDB munitions for the first time |url=https://english.nv.ua/nation/ukraine-reportedly-uses-glsdb-munitions-for-the-first-time-50392831.html |access-date=2024-07-05 |website=english.nv.ua |language=en}}{{Cite web |title=The invaders claim a GLSDB strike in Luhansk region |url=https://mil.in.ua/en/news/the-invaders-claim-a-glsdb-strike-in-luhansk-region/ |access-date=2024-07-05 |website=Militarnyi |language=en-US}}
• {{USA}}: the United States is the major operator of the GBU-39 (SDB 1).

• {{BHR}}: In 2019 the Bahraini Government purchased as part of sale of several weapons for the Royal Bahraini Air Force's F-16 aircraft fleet 100 GBU-39/B (SDB 1).{{Cite web |date=3 May 2019 |title=Bahrain – Weapons to Support F-16 Block 70/F-16V Aircraft Fleet |url=https://www.dsca.mil/press-media/major-arms-sales/bahrain-weapons-support-f-16-block-70f-16v-aircraft-fleet |url-status=live |archive-url=https://web.archive.org/web/20230708124746/https://www.dsca.mil/press-media/major-arms-sales/bahrain-weapons-support-f-16-block-70f-16v-aircraft-fleet |archive-date=8 July 2023 |access-date=6 July 2023 |website=Defense Security Cooperation Agency}}
• {{BUL}}: In 2019 Bulgaria agreed to purchase 8 F-16C/D Block 70/72 aircraft with 28 GBU-39 (SDB 1) and other munitions. By 2020 Bulgaria had paid 100% of the $1.673 billion cost, however delivery is not expected until 2026.{{Cite web |date=3 June 2019 |title=Bulgaria – F-16C/D Block 70/72 Aircraft with Support |url=https://www.dsca.mil/press-media/major-arms-sales/bulgaria-f-16cd-block-7072-aircraft-support |url-status=live |archive-url=https://web.archive.org/web/20230621045313/https://www.dsca.mil/press-media/major-arms-sales/bulgaria-f-16cd-block-7072-aircraft-support |archive-date=21 June 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}}{{Cite web |last=Nikolov |first=Boyko |date=17 May 2023 |title=US refuses replacement F-16s to Bulgaria, recommends MiG-29s |url=https://bulgarianmilitary.com/2023/05/17/us-refuses-replacement-f-16s-to-bulgaria-recommends-mig-29s/ |url-status=live |archive-url=https://web.archive.org/web/20230608023026/https://bulgarianmilitary.com/2023/05/17/us-refuses-replacement-f-16s-to-bulgaria-recommends-mig-29s/ |archive-date=8 June 2023 |access-date=2 July 2023 |website=Bulgarian Military |language=en-US}} In 2022 Bulgaria was approved to purchase another 8 F-16 C/D Block 70 aircraft, with another 28 GBU-39 (SDB 1), for the same cost.{{Cite web |date=4 April 2022 |title=Bulgaria – F-16 C/D Block 70 Aircraft |url=https://www.dsca.mil/press-media/major-arms-sales/bulgaria-f-16-cd-block-70-aircraft |url-status=live |archive-url=https://web.archive.org/web/20231006122826/https://www.dsca.mil/press-media/major-arms-sales/bulgaria-f-16-cd-block-70-aircraft |archive-date=6 October 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}}
• {{FIN}}: Finland chose SDB I and SDB II guided bombs along with F-35s. https://www.defmin.fi/en/topical/press_releases_and_news/press_release_archive/2021/the_lockheed_martin_f-35a_lightning_ii_is_finland_s_next_multi-role_fighter.12335.news
• {{MAR}}: On December 20, 2024, the United States approved a possible sale of 500 GBU-39Bs and related equipment to Morocco for an estimated $86 million.{{Cite web |title=Kingdom of Morocco – GBU-39B Small Diameter Bombs (SDB-I) {{!}} Defense Security Cooperation Agency |url=https://www.dsca.mil/press-media/major-arms-sales/kingdom-morocco-gbu-39b-small-diameter-bombs-sdb-i |access-date=2024-12-24 |website=www.dsca.mil}}
• {{Flag|NATO}}: In 2022, a request by NATO to purchase precision-guided munitions, including 279 GBU-39/B (SDB 1) was approved by the US Government.{{Cite web |date=22 June 2022 |title=NATO Support and Procurement Agency (NSPA) – Precision Guided Munitions |url=https://www.dsca.mil/press-media/major-arms-sales/nato-support-and-procurement-agency-nspa-precision-guided-munitions |url-status=live |archive-url=https://web.archive.org/web/20230122181630/https://www.dsca.mil/press-media/major-arms-sales/nato-support-and-procurement-agency-nspa-precision-guided-munitions |archive-date=22 January 2023 |website=Defense Security Cooperation Agency}}
• {{PRT}}: Portuguese Air Force is procuring GBU-39/B bombs through the Ammunition Support Partnership.{{Cite web |last=admin |date=2023-03-21 |title=Portugal To Procure Small Diameter Bomb Via NATO Support And Procurement Agency - MilitaryLeak.COM |url=https://militaryleak.com/2023/03/21/portugal-to-procure-small-diameter-bomb-via-nato-support-and-procurement-agency/ |access-date=2024-02-25 |website=militaryleak.com |language=en-US}}
• {{ROU}}: Romanian Air Force is procuring 400 GBU-39B bombs and two GBU-39 (T-1)/B inert practice bombs with fuze. The estimated total cost is $84 million.{{Cite web |last=admin |date=2025-02-19 |title=Romania – GBU-39B Small Diameter Bombs |url=https://www.dsca.mil/press-media/major-arms-sales/romania-gbu-39b-small-diameter-bombs|access-date=2025-02-19 |website=dsca.mil |language=en-US}}{{source-attribution}}
• {{Flag|Turkey}}: In 2024, the US approved to sell GBU-39/B to Turkey{{cite web | url=https://www.dsca.mil/press-media/major-arms-sales/turkiye-f-16-aircraft-acquisition-and-modernization | title=Türkiye – F-16 Aircraft Acquisition and Modernization | Defense Security Cooperation Agency }}
• {{UAE}}: In 2013 a request to purchase 5,000 GBU-39/B (SDB 1) as part of a sale of various munitions was approved.{{Cite web |date=15 October 2013 |title=United Arab Emirates (UAE) - Various Munitions and Support |url=https://www.dsca.mil/press-media/major-arms-sales/united-arab-emirates-uae-various-munitions-and-support |url-status=live |archive-url=https://web.archive.org/web/20230702035741/https://www.dsca.mil/press-media/major-arms-sales/united-arab-emirates-uae-various-munitions-and-support |archive-date=2 July 2023 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}} In 2020 request to purchase another 2,500 GBU-39/B (SDB 1) was accepted.{{Cite web |date=10 November 2020 |title=United Arab Emirates – Munitions, Sustainment and Support |url=https://www.dsca.mil/press-media/major-arms-sales/united-arab-emirates-munitions-sustainment-and-support-0 |url-status=live |archive-url=https://web.archive.org/web/20240101080556/https://www.dsca.mil/press-media/major-arms-sales/united-arab-emirates-munitions-sustainment-and-support-0 |archive-date=1 January 2024 |access-date=2 July 2023 |website=Defense Security Cooperation Agency}}

• GBU-53/B StormBreaker – Precision-guided laser bomb, formerly called Small Diameter Bomb II. US Air Force selected Raytheon over Boeing to develop the SDB II.
• Spice (bomb) – Israeli precision bomb convertible unguided to guided

{{Reflist}}

{{Commons category|GBU-39 Small Diameter Bomb}}

• [http://www.globalsecurity.org/military/systems/munitions/sdb.htm GBU-39 Small Diameter Bomb / Small Smart Bomb - Global Security]
• [http://www.globalsecurity.org/military/systems/munitions/sdb-flm.htm Small Diameter Bomb SDB Focused Lethality Munition (FLM) - Global Security]
• [http://www.ausairpower.net/APA-SDB.html GBU-39/40/42/B Small Diameter Bomb I/II]

{{USAF Weapons}}

Category:Guided bombs of the United States

Category:Boeing

Category:Military equipment introduced in the 2000s