U.S. Marine Corps Gunnery Sgt. Harold Rivera, Assistant Training Chief S-3, Headquarters and Service Company, Marine Corps Combat Service Support Schools (MCCSSS), recites the "Oath of Enlistment" during his promotion ceremony at the Vietnam Memorial, Jacksonville, N.C., Sept. 4, 2013. (U.S. Marine Corps Combat Camera photo by Sergeant Mark E. Morrow/Released)