U.S. Marine UH-1Y Huey helicopter evacuates casualties during an enhanced motorized operation course mock battlefield scenario at Integrated Training Exercise 2-15, Marine Corps Air Ground Combat Center (MCAGCC) Twentynine Palms, Calif., Feb. 15, 2015.
Turret gunners with Combat Logistics Battalion 7 pray over each other before a combat logistics patrol aboard Camp Leatherneck, Afghanistan, July 14, 2014.
U.S. Marines throw M69 practice
grenades during sustainment training at D’Arta Plage, Djibouti, Nov. 1, 2014
Lance Cpl. Adam Chaffee, a mortarman with Weapons Company, 1st Battalion, 25th Marine Regiment, and a native of Charlestown, N.H., watches the sun set while manning a post at Patrol Base Boldak, Helmand province, Oct. 3, 2011
A U.S. Marine, left, and a Sailor, right, both with the Marine Corps Fox Company, 2nd Battalion, 8th Marine Regiment, Regimental Combat Team 7, assist a simulated casualty during a mission rehearsal at Camp Bastion, Helmand province, Afghanistan, May 28, 2013.