Marines with Golf Battery, 2nd Battalion, 10th Marine Regiment, 2nd Marine Division, fire 120 mm high explosive mortar rounds from an Expeditionary Fire Support System during Exercise Rolling Thunder 2-15 aboard Fort Bragg, N.C., March 9, 2015. Marines will be receiving a new, 120 mm precision extended range munition, called PERM, which will double the range and provide GPS accuracy to the existing EFSS. Marine Corps Systems Command awarded a contract Dec. 8 for the new mortar rounds. (U.S. Marine Corps photo by Sgt. James R. Smith) - Marines with Golf Battery, 2nd Battalion, 10th Marine Regiment, 2nd Marine Division, fire 120 mm high explosive mortar rounds from an Expeditionary Fire Support System during Exercise Rolling Thunder 2-15 aboard Fort Bragg, N.C., March 9, 2015. Marines will be receiving a new, 120 mm precision extended range munition, called PERM, which will double the range and provide GPS accuracy to the existing EFSS. Marine Corps Systems Command awarded a contract Dec. 8 for the new mortar rounds. (U.S. Marine Corps photo by Sgt. James R. Smith)