U.S. Marines assigned to 3rd Battalion, 12th Marine Regiment, deliver artillery rounds down range as a part of 1st Battalion, 4th Marine Regiment's Battalion Assault Course (BAC) during Integrated Training Exercise (ITX) 2-15 at Blacktop Training Area aboard Camp Wilson, Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Feb. 9th, 2015. 4th Marine Regiment was the first regiment in Marine Corps history to ever roll up their colors surrendering to the enemy in World War Two and as a result, was never allowed to operate on U.S. soil until now. 4th Marine Regiment is acting as the Command Element for Special Purpose Marine Air-Ground Task Force 4 (SPMAGTF-4) during Integrated Training exercise (ITX) 2-15 which enhances integration and warfighting capability from all elements of the MAGTF. (U.S. Marine Corps photo by Lance Cpl. Aaron S. Patterson, MCBH Combat Camera/Released)