U.S. Air Force Staff Sgt. Carl Engle, 757th Aircraft Maintenance Squadron crew chief, looks over a technical order log during the Mission Employment Phase exercise, Dec. 7, 2012, at Nellis Air Force Base, Nev. The ME Phase exercise incorporates Air Force capabilities in diverse scenarios to include aircraft in conjunction with space and cyberspace assets. (U.S. Air Force photo/Senior Airman Brett Clashman)