ENGINE CHECK Air Force Staff Sgt. Ryan Brehm inspects an engine while it is tested at the "Hush House" on Eielson Air Force Base, Alaska, Oct. 3, 2013. Brehm, a propulsion flight dock chief, is assigned to the 354th Maintenance Squadron. Airmen rebuild the engines from F-16 Fighting Falcons used during exercise and training missions. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 084966-O-QVG01-668.jpg Photo Gallery