U.S. Air Force Airman 1st Class Jack McKeown, 7th Logistics Readiness Squadron vehicle mechanic, buffs an engine block at Dyess Air Force Base, Texas, March 21, 2017. Old gaskets are buffed off the engine block in order to create a clean and tight seal between the cylinder head and engine block with a new gasket. (U.S. Air Force photo by Airman 1st Class April Lancto)