maintenance
Staff Sgt. Barry Wiles, 748th Aircraft Maintenance Squadron, 493rd Aircraft Maintenance Unit Avionics technician, installs a heads-up display data processor on an F-15C Strike Eagle jet at RAF Lakenheath, England, Feb. 25, 2010. The data processor displays heading, attitude, air speed and other pertinent information to the pilot. (U.S. Air Force photo/Staff Sgt. Connor Estes)