VS-17

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The VS-17 is a signaling device used by military personnel to send signals to aircraft,{{Cite book |url=https://archive.org/details/handbookofsaseli0000unse |title=The Handbook of the SAS and Elite Forces |publisher=Robinson Publishing |year=1997 |isbn=1-85487-675-9 |editor-last=Lewis |editor-first=Jon E. |pages=145 |language=en |url-access=registration |via=Internet Archive}}{{Cite book |url=https://www.bits.de/NRANEU/others/amd-us-archive/FM21-76%2892%29.pdf |title=Field Manual 21-76 |date=5 June 1992 |publisher=United States Department of the Army |page=19-8 |language=en |via=Berliner Informationszentrum für transatlantische Sicherheit}} and to mark improvised landing sites.{{Cite book |url=https://static.e-publishing.af.mil/production/1/af_a3_5/publication/afi13-217/afi13-217.pdf |title=Air Force Instruction 13-217 |date=10 May 2007 |publisher=United States Air Force |pages=45–47 |language=en}}

File:220617-F-UN330-2171 Red Flag Alaska 22-2.jpg, 2022]]

The VS-21 is a replacement for the VS-17 that provides an infrared signature, allowing use in low visibility conditions via thermal imaging.{{cn|date=April 2024}}