A U.S. Marine breaks the seal on his M50 Field Protective Joint Service General Purpose Mask during gas mask qualification at Gimpo Training Area, Republic of Korea, Feb. 25, 2016. The event took place as part of Korean Marine Exchange Program 16-6, a regularly scheduled training event between the ROK and U.S. Marine Corps. This iteration of KMEP focuses on specialized training between military policemen with 3rd Law Enforcement Battalion, III Marine Expeditionary Force Headquarters Group, III MEF, and Military Police Company, 2nd ROK Marine Corps Division. (U.S. Marine Corps Photo by Cpl. Steven Tran/Released)