Navy Petty Officer 1st Class Charlie King, 366th Training Squadron instructor, supervises Army Pfc. Ryan Sivahop, Delta Company, 169th Engineer Battalion, as he uses a blowtorch to solder copper pipe during a water and fuel systems maintenance course plumbing class at Sheppard Air Force Base, Texas, Dec. 5, 2014. Students troubleshoot plumbing systems and make repairs so all fixtures operate properly. (U.S. Air Force Photo Danny Webb/Released)