Using a checklist of approved guests, Lt. Col. Rudolf Kuehne, 319th Air Base Wing chief of safety, verifies the identity of three men attending the 2014 M.A.C.A. Civil Fly-In held June 14, 2014, on Grand Forks Air Force Base, N.D. The trio was on several pilots who were temporarily granted permission to land on the installation in order to attend the event, which is centered around the safety office's Mid-Air Collision Avoidance program. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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