U.S. Air Force Senior Airman Darien Andrews, 52nd Maintenance Squadron aerospace ground equipment journeyman, performs an inspection on a Diesel Generator Ground Power Unit at Spangdahlem Air Base, Germany, Jan. 11, 2019. The unit spins jet engines to their starting revolutions per minute and provides electrical power for aircraft systems. (U.S. Air Force photo by Airman 1st Class Jovante Johnson)