US Air Force (USAF) STAFF Sergeant (SSGT) David Ball, 45th Space Wing (SW) Security Forces team makes his way over the "Balancing Logs" during the Obstacle Course 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) STAFF Sergeant (SSGT) David Ball, 45th Space Wing (SW) Security Forces team makes his way over the "Balancing Logs" during the Obstacle Course 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. 2002-05-08. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6629084. (Accessed June 18, 2018.)
APA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-, (2002-05-08) US Air Force (USAF) STAFF Sergeant (SSGT) David Ball, 45th Space Wing (SW) Security Forces team makes his way over the "Balancing Logs" during the Obstacle Course 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/6629084
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/6629084>.
Note: These citations are programmatically generated and may be incomplete.