131212-F-TJ158-008
A U.S. Air Force pilot waits in the cockpit of an F-35 Lightning II during a hot refuel on Eglin Air Force Base, Fla., Dec. 12, 2013. The F-35 is a single seat, fifth generation, multi-role fighter in development to perform ground-attack, reconnaissance and air defense missions. (U.S. Air Force photo/Senior Airman Christopher Callaway)