ELLSWORTH AFB, S.D. - Airman Dameon Parker, 28th Logistics Readiness Squadron individual protection equipment augmentee, secures an M-50 gas mask to a Joint Service Mask Leakage Tester as part of a routine inspection, Sept. 22. Airman Parker tested the mask to ensure it is impermeable to toxins. (U.S. Air Force photo/Senior Airman Kasey Close)