U.S. Air Force Senior Airman Efren Estrada and Airman 1st Class Brandon Wilson, 1st Maintenance Group fuels technicians, prepare a fuel tank for installation at Joint Base Langley-Eustis, Virginia, March 15, 2021. Estrada and Wilson will learn the facts of principles of the F-22 Raptor fuel system as well as the On-Board Inert Gas Generating system operations and safety hazards. (U.S. Air Force photo by Staff Sgt. Ericha Fitzgerald)