U.S. Marine Corps Poolees with Marine Corps Recruiting Sub-Stations North and South Columbus stand on the ice during an Oath of Enlistment ceremony at the Columbus Blue Jackets game Jan. 21, 2017. The Oath of Enlistment pledge is made by each enlisted member of the Armed Forces. This is the final step before basic training and confirms their duty to defend the constitution and obey orders given by officers appointed over them. (U.S. Marine Corps photo by Sgt. Caitlin Brink/Released) - U.S. Marine Corps Poolees with Marine Corps Recruiting Sub-Stations North and South Columbus stand on the ice during an Oath of Enlistment ceremony at the Columbus Blue Jackets game Jan. 21, 2017. The Oath of Enlistment pledge is made by each enlisted member of the Armed Forces. This is the final step before basic training and confirms their duty to defend the constitution and obey orders given by officers appointed over them. (U.S. Marine Corps photo by Sgt. Caitlin Brink/Released)

A U.S. Marine walks with his poolees to their objective point during the practical application period of land navigation at Hogback Ridge Park February 18. These poolees were taught land navigation by their recruiters from Marine Corps Recruiting Substation Mentor, Ohio. Land navigation is an important part of the recruit training at Marine Corps Recruit Depot Parris Island, South Carolina. Recruits are expected to pass two different land navigation training events. (U.S. Marine Corps photo by Sgt. Stephen D. Himes/Released) - A U.S. Marine walks with his poolees to their objective point during the practical application period of land navigation at Hogback Ridge Park February 18. These poolees were taught land navigation by their recruiters from Marine Corps Recruiting Substation Mentor, Ohio. Land navigation is an important part of the recruit training at Marine Corps Recruit Depot Parris Island, South Carolina. Recruits are expected to pass two different land navigation training events. (U.S. Marine Corps photo by Sgt. Stephen D. Himes/Released)