U.S. Air National Guard Airmen from the 108th Wing practice replacing filters on their M50 gas masks during an ability to survive and operate training class on Joint Base McGuire-Dix-Lakehurst, N.J., Oct. 20, 2018. The class included decontamination procedures, self aid and buddy care, and proper wear of the M50 gas mask. (U.S. Air National Guard photo by Master Sgt. Matt Hecht)