A Reserve Citizen Airman from the 914th Air Refueling Wing has his gas mask adjusted by an instructor during an annual readiness assessment, conducted at Niagara Falls Air Reserve Station, N.Y., September 9, 2017. The assessment is meant to guage the unit's ability to operate in different protective postures (MOPP) as well as perform self aid and buddy care. (U.S. Air Force photo by Tech. Sgt. Steph Sawyer)