Direct Commissioning Indoctrination. Headquarters, United States Air Force, gave the Officer Candidate School an additional assignment in April 1951. The Korean War revived the Air Force practice of directly commissioning enlistees with professional and special experience. The Air Force was having particular difficulty satisfying a need for engineers and physical scientists. Also hard to recruit were qualified women willing to be WAF officers. It wanted a program to make enlistment more attractive and to provide indoctrination to those inducted. The OCS devised an eight-week Officer Basic Military Course (OBMC). The inaugural Class 1951-A began on 17 September 1951 with 56 newly commissioned second and first lieutenants (46 women; 10 men). Class 1952-A (49 women; 17 men) began on 19 November 1951. Although the 3721st Training Squadron (Officer) activated on 19 December 1951 to assume this mission, the course and its instructors had already become defined in local usage as the USAF Officers Basic Military School, in time being refined as the USAF Officer Training School. [No evidence came to light confirming either name as official.] Class sizes ranged from 100 to 300 new officers during 1952.

As the practice of direct commissioning decreased in 1953, the Air Staff decided to supplement enrollment in the Officer Basic Military Course with newly inducted and commissioned chaplains, no longer sending them to the Army Chaplain School after July 1953. The Officer Candidate School had published a modified OBMC outline for chaplains in June 1954, titled the Officer Basic Military Course (Chaplain). New chaplains shared all academic instruction and all physical training with other OBMC students but dropped some military indoctrination. Instead of voice and command, drill and ceremonies, and small arms, the chaplains studied pastoral, religious education, counseling, devotional, and service subjects.

By 1955, induction of directly commissioned officers had become negligible, as indicated by Class 1955-A and Class 1955-B. The one graduated 13 pilot trainees and 9 chaplains on 21 January; the other graduated of 9 pilot trainees, 2 Air National Guardsmen and 17 chaplains. After Class 1955-B graduated on 25 March, responsibility for indoctrinating those directly commissioned reverted to their gaining commands. Thereafter, only chaplains attended OBMC.

Once only chaplains attended OBMC, the school's curriculum writers drafted a new course outline, the United States Air Force Chaplain Course, which went into use on 5 December 1955. Air Force chaplains now had their own "school," which now came under the direction of Headquarters, Officer Military Schools, USAF. To this program was added an advanced course for staff chaplains in late 1960. The common practice of calling this program for chaplains a "school" became official on I June 1960, when the Air Staff established the United States Air Force Chaplain School, a named activity. It is later reassigned to the Officer Training School before being discontinued on I July 1966.