U.S. Air Force Tech. Sgt. Jesse Pickrell, Combat Shield crew lead, 16th Electronic Warfare Squadron, Eglin Air Force Base, Fla., prepares a USM-642 Raven signal generator on the flighline at Spangdalem Air Base, Germany, March 23, 2017, during a Combat Shield inspection. The Combat Shield crew used the USM-642 to simulate real-world radar emissions and test the sensitivity of the threat detection systems of an F-16 assigned to Spangdahlem. (U.S. Air Force photo by Senior Airman Dawn M. Weber)