U.S. Air Force Senior Airman Efren Estrada and Airman 1st Class Brandon Wilson, 1st Maintenance Group fuels technicians, exchange tools for fuel tank installation during F-22 Raptor fuel system and On-Board Inert Gas Generating system training at Joint Base Langley-Eustis, Virginia, March 15, 2021. The course spans 10 days of academic instruction and includes both lecture and hands-on training opportunities for Airmen. (U.S. Air Force photo by Staff Sgt. Ericha Fitzgerald)