Senior Airman Stuart McCallum, left, 457th Airlift Squadron life support technician annotates in a digital technical order manual, as Staff Sgt. Daniel Matthews, 457 AS aircrew flight equipment craftsman, performs a test on a PRC-90 radio used by pilots. The ten minute inspection includes several tests for the radio, such as frequency errors, battery signal strength and sound modulation. The radio which is part of the pilot’s T-9 life raft survival kit is tested bimonthly. (U.S. Air Force photo/ Bobby Jones)