Avionics technicians assigned to the 4th and 414th Aircraft Maintenance Squadrons inspect the Joint Service Electronic Combat Systems Tester on Oct. 13, 2015, at Seymour Johnson Air Force Base, North Carolina. The JSECST equipment is used to test the ALR-56C Radar Warning Receiver, the aircraft’s primary defensive system, which detects enemy radio transmissions and alerts aircrews they’re being targeted. (U.S. Air Force photo/Senior Airman Aaron J. Jenne)