US Air Force SENIOR AIRMAN Efrain Espinoza, from team Air Force Space Command, prepares to engage on targets down range with a M60 machine gun. This took place during a simulated gas attack scenario for a Combat Weapons event at DEFENDER CHALLENGE 2000 on Lackland Air Force Base, Texas, October 31st, 2000. DEFENDER CHALLENGE is the annual Air Force wide competition sponsored by Air Force Security Forces. This competition showcases the talents and capabilities of 13 international Security Forces teams seven physical fitness events, base defense, and policing skills over six days

Chicago citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-. US Air Force SENIOR AIRMAN Efrain Espinoza, from team Air Force Space Command, prepares to engage on targets down range with a M60 machine gun. This took place during a simulated gas attack scenario for a Combat Weapons event at DEFENDER CHALLENGE 2000 on Lackland Air Force Base, Texas, October 31st, 2000. DEFENDER CHALLENGE is the annual Air Force wide competition sponsored by Air Force Security Forces. This competition showcases the talents and capabilities of 13 international Security Forces teams seven physical fitness events, base defense, and policing skills over six days. 2000-10-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6514841. (Accessed June 18, 2018.)
APA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-, (2000-10-31) US Air Force SENIOR AIRMAN Efrain Espinoza, from team Air Force Space Command, prepares to engage on targets down range with a M60 machine gun. This took place during a simulated gas attack scenario for a Combat Weapons event at DEFENDER CHALLENGE 2000 on Lackland Air Force Base, Texas, October 31st, 2000. DEFENDER CHALLENGE is the annual Air Force wide competition sponsored by Air Force Security Forces. This competition showcases the talents and capabilities of 13 international Security Forces teams seven physical fitness events, base defense, and policing skills over six days. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6514841
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/6514841>.
Note: These citations are programmatically generated and may be incomplete.