Marines with Weapons Company, Battalion Landing Team, 3rd Battalion, 2nd Marine Regiment, 22nd Marine Expeditionary Unit, plunge under water in the Modular Amphibious Egress Trainer, also known as the "helo dunker," during the Shallow Water Egress Training course, Dec. 8 - 9, aboard Camp Lejeune, N.C. The course taught the Marines to escape a helicopter in the event of a water landing.