DESOTO patrol
DESOTO patrols (DeHaven Special Operations off TsingtaO){{cite web
| last = James W. Montgomery
| title = The First DESOTO Patrol
| url = http://ussdehaven.org/first_desoto_patrol.htm
| accessdate = 2010-05-04}}
were patrols conducted by U.S. Navy destroyers equipped with a mobile "van"{{clarify|date=April 2025}} of signals-intelligence equipment used for intelligence collection in hostile waters.{{cite web
|last = National Security Agency
|authorlink = National Security Agency
|title = Gulf of Tonkin
|work = declassified materials, 2005 and 2006
|date = 30 November 2005
|url = http://www.espionageinfo.com/An-Ba/Army-Security-Agency.html
|accessdate = 2007-10-02
|archive-url = https://web.archive.org/web/20070911222802/http://www.espionageinfo.com/An-Ba/Army-Security-Agency.html
|archive-date = 2007-09-11
|url-status = dead
}}
The {{USS|De Haven|DD-727|6}} became the namesake for these patrols.{{cite web|url= http://www.nsa.gov/public_info/_files/gulf_of_tonkin/articles/rel1_gulf_tonkin_incident.pdf|title= The Gulf of Tonkin Incident|accessdate= 6 Jul 2013|date= Feb 1975|archive-url= https://web.archive.org/web/20130918030716/http://www.nsa.gov/public_info/_files/gulf_of_tonkin/articles/rel1_gulf_tonkin_incident.pdf|archive-date= 2013-09-18|url-status= dead}} De Haven performed the first patrol off the coast of China in April 1962. The {{USS|Agerholm|DD-826|6}} carried out the first patrol to target North Vietnam in the Gulf of Tonkin in December 1962.
File:USS De Haven (DD-727).jpg
These patrols were initially a response to the Chinese Communists' unexpected re-definition{{when|date=July 2019}} of their territorial waters to include all waters shoreward from lines drawn tangentially to, and between, twelve-mile circles drawn around their offshore islands. Such a declaration represented a huge expansion of their claims. This inhibited the lawful navigation of international waters as defined by US interests and increased the likelihood and frequency of formal diplomatic "serious warnings" issued by Beijing when any Seventh Fleet units navigated through these areas. This became a situation to which Commander Seventh Fleet felt compelled to respond.
These types of patrols had previously been conducted off the coasts of the Soviet Union, China, and North Korea, but are perhaps of greatest significance for their role in the Vietnam War. There were three components to the purpose of these patrols. First, they would establish and maintain the presence of the
U.S. Seventh Fleet in the international waters off the China coast and later the Vietnamese coast. Second, they would serve as a minor Cold War irritant to the Chinese Communists. Third, they would collect as much intelligence
as possible during the patrols.
Tactically, the patrols off Vietnam aimed to intercept North Vietnamese Army intelligence and to relay it to South Vietnamese Army forces. With the intercepted communications, the South Vietnamese were able to more effectively coordinate their raids. The aircraft carrier {{USS|Ticonderoga|CV-14|6}} provided destroyers taking part in the DESOTO patrols off Vietnam with air support.
The DESOTO patrols off Vietnam from 1963 onwards formed part of a larger scheme known as Operation 34A. Run by the Department of Defense at the time, Operation 34A, or "OPLAN 34Alpha" was a top-secret program consisting primarily of covert actions against the North Vietnamese.{{citation needed|date= February 2017}}
Patrols and SIGADs
The naval Direct Support Units (DSUs) based out of the U.S. Naval Communication Station, Philippines, in San Miguel, Philippines (SIGAD USN-27){{cite web|url=http://www.nsa.gov/public_info/_files/cryptologic_histories/spartans_in_darkness.pdf|title=Spartans in Darkness:American SIGINT and the Indochina war, 1945-1975|pages=498–500|date=24 February 1998|accessdate=11 June 2013|archive-url=https://web.archive.org/web/20130918015958/http://www.nsa.gov/public_info/_files/cryptologic_histories/spartans_in_darkness.pdf|archive-date=2013-09-18|url-status=dead}} used the SIGAD USN-467 as a generic designator for their missions. Each specific patrol received a letter suffix for its duration. The subsequent mission would receive the next letter in an alphabetic sequence.{{cite book|author=William Gerhard|title=In the Shadow of War (To the Gulf of Tonkin), Cryptologic History Series, Southeast Asia| date=June 1969| publisher=National Security Agency|page=51}}
=Declassified SIGADs=
The following table lists the patrols that have been declassified.{{cite web|url=http://www.nsa.gov/public_info/_files/gulf_of_tonkin/memos/rel1_latimer.pdf|title=Operational History|page=12|date=26 May 1965|accessdate=6 July 2013|archive-url=https://web.archive.org/web/20130918030613/http://www.nsa.gov/public_info/_files/gulf_of_tonkin/memos/rel1_latimer.pdf|archive-date=18 September 2013|url-status=dead}}{{cite web|url=http://www.nsa.gov/public_info/_files/gulf_of_tonkin/memos/rel1_latimer.pdf|title=Operational History|page=2|date=26 May 1965|accessdate=6 July 2013|archive-url=https://web.archive.org/web/20130918030613/http://www.nsa.gov/public_info/_files/gulf_of_tonkin/memos/rel1_latimer.pdf|archive-date=18 September 2013|url-status=dead}}
File:DESOTO patrol mission map off Vietnam 1964.png
| class="wikitable" style="margin: 1em auto 0em auto; text-align:center" |
| Patrol Number
! Patrol Dates ! Primary Patrol Ship ! SIGAD |
|---|
| 1
| 14–20 April 1962 | {{USS|De Haven|DD-727|6}} | USN-467? |
| 9
| December 1964 | {{USS|Agerholm|DD-826|6}} | USN-467? |
| ?
| 25 February - 12 March 1964 | {{USS|John R. Craig|DD-885|6}} | USN-467Y |
| 18
| 28 July - 23 August 1964 | {{USS|Maddox|DD-731|6}} | USN-467N |
| 19
| 14–21 September 1964 | {{USS|Morton|DD-948|6}} | USN-467P |
| 20
| 1–15 October 1964 | {{USS|Richard S. Edwards|DD-950|6}} | USN-467R-1 |
| 21
| 15 October - 14 November 1964 | USS Morton | USN-467R-2 |
| 22
| 8–14 November 1964 | USS Richard S. Edwards | USN-467S |
| 23
| 14 November - 27 December 1964 | USS Richard S. Edwards | USN-467R-3 |
| 24
| 8–14 February 1965 | {{USS|Towers|DDG-9|6}} | USN-467D |
| 25
| 15 February - 19 March 1965 | {{USS|Buchanan|DDG-14|6}} | USN-467D |
| 26
| 19 March - 21 April 1965 | USN-27/USS Buchanan | USN-467D |
Gulf of Tonkin Incident
File:USS Maddox (DD-731) underway at sea, circa the early 1960s (NH 97900).jpg
SIGAD USN-467N specifically designates the DSU aboard {{USS|Maddox|DD-731|6}} during the patrol involved with the Gulf of Tonkin incident.{{cite web|url=http://www.nsa.gov/public_info/_files/cryptologic_quarterly/Skunks.pdf |title=Skunks, Bogies, Silent Hounds, and the Flying Fish: The Gulf of Tonkin Mystery, 2-4 August 1964 |page=50 |date= 24 February 1996 |accessdate= 11 June 2013 |url-status=dead |archiveurl=https://web.archive.org/web/20131011150926/http://www.nsa.gov/public_info/_files/cryptologic_quarterly/Skunks.pdf |archivedate=October 11, 2013 }} This patrol was 18th DESOTO type patrol (each with a Naval Security Group detachment embarked) conducted since 1962.{{cite web|url=http://www.nsa.gov/public_info/_files/gulf_of_tonkin/memos/rel1_latimer.pdf|title=Operational History|page=10|date=26 May 1965|accessdate=6 July 2013|archive-url=https://web.archive.org/web/20130918030613/http://www.nsa.gov/public_info/_files/gulf_of_tonkin/memos/rel1_latimer.pdf|archive-date=18 September 2013|url-status=dead}} On August 2, 1964, the destroyer Maddox, engaged three North Vietnamese Navy torpedo boats of the 135th Torpedo Squadron.{{Harvnb|Moïse|1996|p=78}}. A sea battle resulted, in which Maddox expended over two hundred and eighty {{convert|3|in|mm|adj=on|0}} and {{convert|5|in|mm|adj=on|0}} shells, and in which four USN F-8 Crusader jet fighter bombers strafed the torpedo boats. One US aircraft was damaged, one {{convert|14.5|mm|adj=on|sp=us}} round hit the destroyer, three North Vietnamese torpedo boats were damaged, and four North Vietnamese sailors were killed and six were wounded; there were no U.S. casualties.{{Harvnb|Moïse|1996|pp=78, 82, 92}}.
Post Gulf of Tonkin Engagement
File:USS Morton (DD-948) off Aruba in October 1959.jpg
Even after the Gulf of Tonkin incident, the DESOTO patrols continued. On 11 September 1964 the Director of the Naval Security Group, Pacific (DIRNAVSECGRUPAC) informed the Director of the NSA (DIRNSA) of plans for an intercept team, SIGAD USN-467P, to be aboard {{USS|Morton|DD-948|6}}. The patrol was conducted by USS Morton and {{USS|Richard S. Edwards|DD-950|6}} approximately one month after the Gulf of Tonkin incident.{{cite web|page=5|url=http://www.nsa.gov/public_info/_files/gulf_of_tonkin/chrono/rel2_lang.pdf|title=REVIEW OF THE DESOTO PATROL: 16-20 September 1964|accessdate=6 Jul 2013|date=14 Jan 1965|archive-url=https://web.archive.org/web/20130918030603/http://www.nsa.gov/public_info/_files/gulf_of_tonkin/chrono/rel2_lang.pdf|archive-date=2013-09-18|url-status=dead}} During this patrol Morton fired upon five fast closing targets, but was unable to confirm the targets visually. Based on radar surveillance the patrol claimed hits on three of the targets.
See also
References
{{reflist|30em}}
=Works cited=
- {{cite book |last1=Moïse |first1=Edwin E. |title=Tonkin Gulf and the escalation of the Vietnam War |date=1996 |publisher=University of North Carolina Press |location=Chapel Hill |isbn=0-8078-2300-7}}
{{DEFAULTSORT:Desoto Patrol}}