Checks inside an F-35A

Capt. Brad Matherne conducts pre-flight checks inside an F-35A Lightning II before a training mission April 4, 2013, at Nellis Air Force Base, Nev. The F-35A will be integrated into advanced training programs such as the USAF Weapons School, Red Flag and Green Flag exercises. Matherne is a 422nd TES pilot. (U.S. Air Force photo/Senior Airman Brett Clashman)