A mortar team with 1st Battalion, 2nd Marine Regiment, take cover on the firing line as a mortar round shoots out of the barrel during a training exercise at Camp Lejeune, N.C., June 6, 2016. Marines underwent mortar familiarization and proficiency training in preparation for their upcoming deployment in support of Special-Purpose Marine Air-Ground Task Force. (U.S. Marine Corps photo by Lance Cpl. Aaron K. Fiala/Released) - A mortar team with 1st Battalion, 2nd Marine Regiment, take cover on the firing line as a mortar round shoots out of the barrel during a training exercise at Camp Lejeune, N.C., June 6, 2016. Marines underwent mortar familiarization and proficiency training in preparation for their upcoming deployment in support of Special-Purpose Marine Air-Ground Task Force. (U.S. Marine Corps photo by Lance Cpl. Aaron K. Fiala/Released)