ENGINES CHECKED A U.S. Air Force crew chief performs a post-flight check on a U.S. Air Force A-10 Thunderbolt II engine on Nellis Air Force Base, Nev., March 1, 2011. The crew chief is assigned to the 127th Aircraft Maintenance Squadron. He is participating in Red Flag 11-3, a realistic combat training exercise involving the U.S. Air Force and its allies. SHARE IMAGE: Download Image: Full Size (0.05 MB) Photo By: VIRIN: 262266-F-BDR11-406.jpg Photo Gallery