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)

Cpl. Eric Bobst, an Infantry Automatic Rifleman with personal security detachment, 2nd Battalion, 7th Marines, Regimental Combat Team 7, fires his IAR at a close-quarters range at Forward Operating Base Sabit Qadam, Oct. 22. The IAR is replacing the M249 Light Machine Gun as the automatic weapon organic to the infantry squad. - Cpl. Eric Bobst, an Infantry Automatic Rifleman with personal security detachment, 2nd Battalion, 7th Marines, Regimental Combat Team 7, fires his IAR at a close-quarters range at Forward Operating Base Sabit Qadam, Oct. 22. The IAR is replacing the M249 Light Machine Gun as the automatic weapon organic to the infantry squad.