Marines with Bravo Company, 1st Battalion, 7th Marine Regiment, sprint across a field to load onto a CH-53E Super Stallion helicopter during a mission in Helmand province, Afghanistan, July 4, 2014. The company operated in Gereshk for three days and was involved in numerous kinetic engagements with Taliban insurgents.(U.S. Marine Corps photo by Cpl. Joseph Scanlan / released) - Marines with Bravo Company, 1st Battalion, 7th Marine Regiment, sprint across a field to load onto a CH-53E Super Stallion helicopter during a mission in Helmand province, Afghanistan, July 4, 2014. The company operated in Gereshk for three days and was involved in numerous kinetic engagements with Taliban insurgents. (U.S. Marine Corps photo by Cpl. Joseph Scanlan / released)

Soldiers with the Afghan National Army carry a simulated casualty on a stretcher and place him in an ambulance as part of a mass casualty simulation held, Sept. 9, 2012. During the mass casualty simulation, members of the Afghan National Army were given a list of symptoms and wounds. ANA medics then had to determine the proper way to treat them and who needed to be treated first depending on their wounds. - Soldiers with the Afghan National Army carry a simulated casualty on a stretcher and place him in an ambulance as part of a mass casualty simulation held, Sept. 9, 2012. During the mass casualty simulation, members of the Afghan National Army were given a list of symptoms and wounds. ANA medics then had to determine the proper way to treat them and who needed to be treated first depending on their wounds.