Simulated helicopter crash

Sgt. Gregory Stewart looks on as a fellow Marine learns proper underwater breathing techniques during a training exercise at Camp Lejeune, N.C., Sept. 26, 2016. The Modular Amphibious Egress Training, also known as the Helo Dunker, teaches Marines survival techniques to use if a helicopter lands in the water. Stewart is a crewman with 2nd Light Armored Reconnaissance Battalion.