In the USA, Officer Candidate School (OCS) is a training program for NCOs and recent college graduates to acquire commissions as officers. The 3 sources to gain a commission in the United States Armed Forces is through OCSor OTS, through ROTC or through one of the four military academies.

The Officer Candidates School of the United States Marine Corps, the initial training of Marine officers, is located in Quantico, Virginia.

The Officer Candidates School of the United States Navy is located in Pensacola, Florida