U.S. Air Force Senior Airman Patrick Marvel, 633rd Civil Engineer Squadron pavement and construction equipment craftsman, protects his sector during a Prime Base Engineer Emergency Force convoy training at Joint Base Langley-Eustis, Va., June 15, 2017. The 633rd CES Airmen are required to establish, operate and maintain a wide variety of engineering skills to support state-side and deployed locations. (U.S. Air Force photo/Airman 1st Class Kaylee Dubois)