Basic Officer Leaders Course

The Basic Officer Leader Course (BOLC) is a two-phased training course designed to commission officers and prepare them for service in the United States Army. Prospective officers complete Phase I (BOLC A) as either a cadet (United States Military Academy or Reserve Officers' Training Corps) or an officer candidate (Officer Candidate School (United States Army)) before continuing on to BOLC B as Second Lieutenants.

Source: Wikipedia — Basic Officer Leaders Course (CC BY-SA 4.0)