US Air Force (USAF) SENIOR AIRMAN (SRA) Herold Higgins (left) and AIRMAN First Class (A1C) Rick Cardona with the 90th Space Wing (SW), F.E. Warren Air Force Base (AFB), Wyoming (WY), climb a ladder obstacle during Guardian Challenge. Guardian Challenge, the world's premier space and missile competition, is a four-day event hosted annually at Vandenberg AFB, California (CA)

Chicago citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-. US Air Force (USAF) SENIOR AIRMAN (SRA) Herold Higgins (left) and AIRMAN First Class (A1C) Rick Cardona with the 90th Space Wing (SW), F.E. Warren Air Force Base (AFB), Wyoming (WY), climb a ladder obstacle during Guardian Challenge. Guardian Challenge, the world's premier space and missile competition, is a four-day event hosted annually at Vandenberg AFB, California (CA). 2004-05-05. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6663006. (Accessed July 23, 2018.)
APA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-, (2004-05-05) US Air Force (USAF) SENIOR AIRMAN (SRA) Herold Higgins (left) and AIRMAN First Class (A1C) Rick Cardona with the 90th Space Wing (SW), F.E. Warren Air Force Base (AFB), Wyoming (WY), climb a ladder obstacle during Guardian Challenge. Guardian Challenge, the world's premier space and missile competition, is a four-day event hosted annually at Vandenberg AFB, California (CA). Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6663006
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/6663006>.
Note: These citations are programmatically generated and may be incomplete.