U.S. military recruits from the U.S. Navy and Marine Corps prepare to swear the oath of enlistment during a special enlistment ceremony at Mount Rushmore National Memorial in South Dakota, July 3, 2015. Col. Gentry Boswell, 28th Bomb Wing commander, administered the oath, which all servicemembers must make to support and defend the Constitution of the United States. (U.S. Air Force photo by 1st Lt. Rachel Allison/Released)