U.S. Air Force Staff Sgt. John Minnich inserts a pin not used during flight back into an F-16 Fighting Falcon as it returns from combat training during Red Flag-Alaska 12-2 on Eielson Air Force Base, Alaska, June 14, 2012. Minnich, a crew chief, is assigned to the 20th Aircraft Maintenance Squadron, Shaw Air Force Base, S.C. U.S. Air Force Staff Sgt. John Minnich inserts a pin not used during flight back into an F-16 Fighting Falcon as it returns from combat training during Red Flag-Alaska 12-2 on Eielson Air Force Base, Alaska, June 14, 2012. Minnich, a crew chief, is assigned to the 20th Aircraft Maintenance Squadron, Shaw Air Force Base, S.C. SHARE: Download: Full Size (0.95 MB) Tags: photo essays Credit: VIRIN: 095199-P-FDH31-377.jpg Photo Gallery