Keith Parks, 72nd Logistics Readiness Squadron, checks the C-Bag of Senior Airman Ryan Shirk, 72nd Force Support Squadron, in the mobility processing line Oct. 4, 2017, Tinker Air Force Base, Oklahoma. C-Bags consist of mission-oriented protective posture gear, or MOPP, which includes chemical protective suit and gas mask. (U.S. Air Force photo/Kelly White)