Technical Sgt. James Erickson, an avionics integrated technician from the 452nd Maintenance Squadron, checks the bore sight values of a C-17 Globemaster III cargo aircraft Head-Up Display (HUD) display unit being tested on a Display Unit Test Set (DUTS) at March Air Reserve Base, Calif. Avionics technicians install, maintain and repair electronic and electrical systems on all types of aircraft and they also maintain a high degree of readiness here to deploy worldwide to support wartime and contingency operations, and operations other than war in support of national interests and objectives. (U.S. Air Force photo by Val Gempis)