Technical Sgt. James Erickson, an avionics integrated technician assigned to the 452nd Maintenance Squadron, March Air Reserve Base, Calif., checks the bore sight values of a C-17 Globemaster III cargo aircraft Head-Up Display (HUD) unit being tested on a Display Unit Test Set (DUTS). Avionics technicians install, maintain and repair electronic and electrical systems on all types of aircraft and they also maintain a high degree of readiness 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)