U.S. Navy Engineman Second Class James Garcia Reyes, Maritime & Intermodal Training Center Chief Engineering Course student, looks over the technical manual of a Detroit Diesel 12D71 marine engine during maintenance and repair training at Joint Base Langley-Eustis, Virginia, Sept. 1, 2020. The students must learn all aspects of marine maintenance from electrical to mechanical trouble shooting. (U.S. Air Force photo by Staff Sgt. Don Hudson)