
https://en.wikipedia.org/wiki/Officer_Candidate_School_(United_Stat...
The United States Army's Officer Candidate School (OCS), located at Fort Benning, Georgia, trains, assesses, and evaluates potential commissioned officers in the U.S. Army, U.S. Army Reserve, and some Army National Guard. Officer candidates are former enlisted members (E-4 to E9), warrant officers, inter-service transfers, or civilian college graduates who enlist for the "OCS Option" after they complete Basic Combat Training (BCT). The latter are often referred to as "college ops".