Maj. Erik N. Schneider and 1stSgt. Christopher Demosthenous,

Maj. Erik N. Schneider and 1stSgt. Christopher Demosthenous, Charlie Company Commander and First Sergeant, respectively, endure 'The Quigley' at Brown Field, Marine Corps Base Quantico, Va., on March 11, 2016. The mission of Officer Candidates School (OCS) is to "educate and train officer candidates in Marine Corps knowledge and skills within a controlled, challenging, and chaotic environment in order to evaluate and screen individuals for the leadership, moral, mental, and physical qualities required for commissioning as a Marine Corps officer." (U.S. Marine Corps Photo by Cpl. Patrick H. Owens/Released)