An Officer Candidate from the Officer Candidate School (OCS) low-crawls under a barbed wire obstacle on the Montford Point Challenge obstacle course at Marine Corps Base Quantico, Va. on Dec. 8, 2012. The Montford Point Challenge was designed in 2011 to give Candidates a taste of the hardships of the first African-Americans allowed to enlist in the Marine Corps. (U.S. Marine Corps photo by Sgt. Christopher A. Green/Released)