Physical Training Instructor Staff Sgt. Duckworth

Physical Training Instructor Staff Sgt. Duckworth demonstrates 'The Dirty Name' obstacle at the Confidence Course, Brown Field, Marine Corps Base Quantico, Va., on March 10, 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)