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"The mission of Officer Candidates School is to educate, train, evaluate, & screen officer candidates to ensure they possess the moral, intellectual, & physical qualities for commissioning, & the leadership potential to serve successfully as company grade officers in the Operating Forces " - Officer Candidates School Mission Statement.

The United States Marine Corps Officer Candidates School (OCS) is a school located on Marine Corps Base (MCB) Quantico that trains, screens, and evaluates potential Marine Corps officers. Unlike the other United States military services, the majority of Marine Corps officers must complete OCS to earn a commission; the only exception are midshipmen from the United States Naval Academy. Entry to OCS comes from several different commissioning programs:[1] * Platoon Leaders Class (PLC) for college students with more than one year left in school * Naval Reserve Officer Training Corps (NROTC) * Officer Candidates Class (OCC) for college seniors and graduates * Enlisted Commissioning Program (ECP) for enlisted Marines with a college degree * Meritorious Commissioning Program (MCP) for enlisted Marines within 18 months of graduation * Marine Enlisted Commissioning Education Program (MECEP)

Depending on the source, candidates go through either a 6-week, 10-week, or 2 6-week courses over separate summers, designed primarily to screen and evaluate candidates' fitness to lead Marines by placing them in leadership positions in a stressful environment. Students are evaluated during 2-3 day garrison command billets at the company and platoon level, and squad and fire-team level tactical billets during field exercises. The follow-on school to OCS, The Basic School (TBS), is where all the skills and knowledge necessary to be an officer of Marines is imparted to future officers.