A crew chief jumps up to check the top surfaces of an F-16C Fighting Falcon. A crew chief from Ramon Air Base, Israel, jumps up to check the top surfaces of an F-16C Fighting Falcon during exercise Red Flag 09-4 at Nellis Air Force Base, Nev., on July 20, 2009. Red Flag is a realistic combat training exercise that pits U.S. and allied nation air forces against simulated enemy forces in a challenging air, ground, cyberspace and electronic threat environment. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 790532-K-ZBZ60-057.jpg Photo Gallery