Staff Sgt. Jeremy Crombie talks to Senior Airman Trevor Scott via radio headsets during a Global Positioning System initialization test Jan. 11 at Balad Air Base, Iraq. The daily test ensures the system is working properly. Sergeant Crombie and Airman Scott are 332nd Expeditionary Aircraft Maintenance Unit avionics technicians deployed from Spangdahlem AB, Germany. (U.S. Air Force photo/Staff Sgt. Joshua Garcia)