U.S. Air Force Senior Airman Nicholas Flusher, 633rd Civil Engineer Squadron water and fuels system management technician, crosses a moat during a Prime Base Engineer Emergency Force training at Joint Base Langley-Eustis, Va., April 20, 2017. The 633rd CES teams utilized the training was as a way to prepare for various environments that they may encounter on deployment. (U.S. Air Force photo/Airman 1st Class Kaylee Dubois)