U.S. Army Soldiers with Alpha Company, 2-501st Parachute Infantry Regiment, fire an 81mm mortar in support of the Afghan National Army during operation Maiwand 10 in Helmand Province, Afghanistan, Dec. 26, 2017. The Soldiers fired multiple illumination rounds in order to light a nearby area of Marjah where the ANA experienced a nighttime ambush. (U.S. Marine Corps photo by Sgt. Justin T. Updegraff) - U.S. Army Soldiers with Alpha Company, 2-501st Parachute Infantry Regiment, fire an 81mm mortar in support of the Afghan National Army during operation Maiwand 10 in Helmand Province, Afghanistan, Dec. 26, 2017. The Soldiers fired multiple illumination rounds in order to light a nearby area of Marjah where the ANA experienced a nighttime ambush. (U.S. Marine Corps photo by Sgt. Justin T. Updegraff)

Marines with Task Force Southwest tend to a simulated casualty during a Tactical Recovery of Aircraft and Personnel training scenario at Camp Lejeune, N.C., March 2, 2017. The week-long rehearsal consisted of advisory meetings with Afghan role players, medical drills and combat scenarios, preparing the unit for an upcoming deployment to Helmand Province, Afghanistan. Task Force Southwest is comprised of approximately 300 Marines, whose mission will be to train, advise and assist the Afghan National Army 215th Corps and 505th Zone National Police. (U.S. Marine Corps photo by Sgt. Lucas Hopkins) - Marines with Task Force Southwest tend to a simulated casualty during a Tactical Recovery of Aircraft and Personnel training scenario at Camp Lejeune, N.C., March 2, 2017. The week-long rehearsal consisted of advisory meetings with Afghan role players, medical drills and combat scenarios, preparing the unit for an upcoming deployment to Helmand Province, Afghanistan. Task Force Southwest is comprised of approximately 300 Marines, whose mission will be to train, advise and assist the Afghan National Army 215th Corps and 505th Zone National Police. (U.S. Marine Corps photo by Sgt. Lucas Hopkins)

A Marine with Task Force Southwest fires an Mk 19 grenade launcher during a combined arms range at Camp Lejeune, N.C., Jan. 18, 2016. About 25 Marines trained to familiarize themselves on the weapon system in preparation for an upcoming deployment to Helmand Province, Afghanistan. The unit will work in a training and advisory capacity with the Afghan National Army 215th Corps and 505th Zone National Police to reaffirm our commitment to the stability and security in the region. (U.S. Marine Corps photo by Sgt. Lucas Hopkins) - A Marine with Task Force Southwest fires an Mk 19 grenade launcher during a combined arms range at Camp Lejeune, N.C., Jan. 18, 2016. About 25 Marines trained to familiarize themselves on the weapon system in preparation for an upcoming deployment to Helmand Province, Afghanistan. The unit will work in a training and advisory capacity with the Afghan National Army 215th Corps and 505th Zone National Police to reaffirm our commitment to the stability and security in the region. (U.S. Marine Corps photo by Sgt. Lucas Hopkins)