U.S. Air Force Senior Airman Darien Andrews, 52nd Maintenance Squadron aerospace ground equipment journeyman, removes battery parts off of a Diesl Generator Ground Power Unit to check for corrosion at Spangdahlem Air Base, Germany, Jan. 11, 2019. Each part of the unit must be checked annually and damaged or broken parts must be replaced immediately. (U.S. Air Force photo by Airman 1st Class Jovante Johnson)