Marine Candidates participate in a field training exercise at the Officer Candidate School, Marine Corps Base Quantico, Va., June 19, 2017. Candidates must go through three months of intensive training to evaluate and screen individuals for the leadership, moral, mental, and physical qualities required for commissioning as a Marine Corps officer.

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Keywords: air, america, archive, armed, army, comcam, comcamfeature, corps, defence, fex, force, forces, marine, mcb, military, navy, ocs, quantico, reportage, service, serviceman, servicemen, soldier, states, united, usa