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U.S. Air Force Senior Airman Isaac Fields, 746th Expeditionary Aircraft Maintenance Unit avionics, performs an Identification, Friend-or-Foe check on a C-130 Hercules, Feb. 18, 2015, at Al Udeid Air Base, Qatar. IFF is an identification system designed for command and control that enables military and national interrogation systems to identify aircraft, vehicles or forces as friendly and to determine their bearing and range from the interrogator. (U.S. Air Force photo by Senior Airman Kia Atkins)
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