U.S. Air Force Senior Airman Duane Mitchell, 757th Aircraft Maintenance Squadron crew chief, looks underneath an F-15 Eagle during the Mission Employment Phase exercise, Dec. 7, 2012, at Nellis Air Force Base, Nev. The exercise incorporates Air Force capabilities in diverse scenarios which can include aircraft in conjunction with space and cyberspace assets. (U.S. Air Force photo/Senior Airman Brett Clashman)