Staff Sgt. Salvador Gruny, 919th Special Operations Medical Squadron, performs a mask fit test for Tech. Sgt. Esperanza Rosa, 919th Special Operations Wing Financial Management at Duke Field, Fla., Nov. 5. Gruny, NCO in charge of the unit's Bioenvironmental Engineering flight, performed dozens of required mask pressure tests for wing reservists focused on deployment readiness tasks throughout the November unit training assembly. (U.S. Air Force photo/Dan Neely)