Airmen from the 36th Electronic Warfare Squadron out of Eglin Air Force Base, Florida, set up a USM-642 Raven signal generator to test electronic attack pods for F-16 Fighting Falcons at Spangdahlem Air Base, Germany, April 2, 2018. A Combat Shield team visited Spangdahlem April 2-6 to evaluate the reliability of several F-16s’ radar threat warning systems and countermeasures. (U.S. Air Force photo by Staff Sgt. Jonathan Snyder)