Senior Airman Kyle Richert, 52nd Maintenance Squadron avionics journeyman, monitors diagnostics on an F-16 Fighting Falcon during an annual Combat Shield evaluation at Spangdahlem Air Base, Germany, March 23, 2017. A Combat Shield team visited Spangdahlem March 20-24 to evaluate the reliability of several F-16s’ radar threat warning systems and countermeasures. (U.S. Air Force photo by Staff Sgt. Jonathan Snyder)