US Air Force (USAF) personnel assigned to the 30th Space Wing (SW), 76th Helicopter Flight, prepare their UH-60 Black Hawk helicopter for competition at Vandenberg Air Force Base (AFB) California (CA), during Exercise GUARDIAN CHALLENGE 2002. Guardian Challenge, a four-day space and missile competition, is hosted annually at Vandenberg AFB, CA to test the wartime readiness of Air Force Space Command (AFSPC) professionals

Chicago citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-. US Air Force (USAF) personnel assigned to the 30th Space Wing (SW), 76th Helicopter Flight, prepare their UH-60 Black Hawk helicopter for competition at Vandenberg Air Force Base (AFB) California (CA), during Exercise GUARDIAN CHALLENGE 2002. Guardian Challenge, a four-day space and missile competition, is hosted annually at Vandenberg AFB, CA to test the wartime readiness of Air Force Space Command (AFSPC) professionals. 2002-05-07. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6629063. (Accessed June 24, 2018.)
APA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-, (2002-05-07) US Air Force (USAF) personnel assigned to the 30th Space Wing (SW), 76th Helicopter Flight, prepare their UH-60 Black Hawk helicopter for competition at Vandenberg Air Force Base (AFB) California (CA), during Exercise GUARDIAN CHALLENGE 2002. Guardian Challenge, a four-day space and missile competition, is hosted annually at Vandenberg AFB, CA to test the wartime readiness of Air Force Space Command (AFSPC) professionals. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6629063
MLA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/6629063>.
Note: These citations are programmatically generated and may be incomplete.