OCS adopted the class system of training in  which the student body was divided into a first class and a second class where the senior students held OC ranks and the responsibility for training underclassmen in all aspects of military  discipline and decorum similar to the training practices used by the United States Military Academy. However, due to the urgency to turn out officers during wartime,  all of the training - military, academic and physical, had to be compressed into a 4 month period.

OCS was relocated to the San Antonio Aviation Cadet Center (later to become Lackland AFB) in April 1944. After only 14 months at Lackland, the school was relocated to Maxwell Field, Alabama. OCS was returned to the Army Air Forces Military Training Center at Lackland on 1 February 1946. 

The OCS that returned to San Antonio in February 1946 was a shell of its former self. It consisted of two classes (1946-B and 1946-C) that would graduate a total of 33 men. Classes during the second half of 1946 (i.e., 1946-G to 1946-L) averaged 48.5 enrollees per class.

When the United States Air Force was constituted in August 1947, the fledgling Air Training Command began work on organizing the 3700th Officer Candidate Training Group, which was finally established a year later in August 1948. The school remained at Lackland Air Force Base (so named on 3 February 1948) and was extended from four to six months in length. The West Point-type class system of training, was subordinated in 1947 to a student organization with flights, squadrons, and groups as a means of inculcating military discipline, confidence, and command abilities. 

After this transition year, the Air Force OCS,  continued to graduate newly commissioned reserve officers at a rate of 300-600 per year for the next 16 years. The Korean War saw a temporary increase in OCS production, from 970 graduates in 1951 to 1,494 in 1952 and then to 2,085 in 1953.

OCS, the main commissioning program for enlisted personnel, produced about 450 new officers annually between 1953 and the middle of 1957. Most went to non-rated duties, although a few did earn wings. Unique among the commissioning programs, OCS grew, if only slightly, during the last years of the decade when itís annual quota was raised to 600 in 1958.

Then, with the Air Force Academy and ROTC, the Air Force found itself with two major sources of rated officers capable of furnishing numbers far in excess of need. Cuts had to be made, and the deciding factor on where to make those cuts was the serviceís long-standing goal of having a college-educated officer corps. Since Aviation Cadets attracted few with college degrees, the cadet program was an obvious target. Once the primary source for rated officers, the Aviation Cadet programís percentage of new rated officers fell from 70% in1957 to just 12% in 1959.

It soon became obvious that the Air Force needed to develop a program that could produce college-educated officers and still respond to the rapid changes in manpower needs. The answer was a program for which only college graduates or those within six months of graduation could apply. That program was the Officer Training School, or OTS. The first class of the Officer Training School (1960-A), consisting of 79 men and 13 women graduated at Lackland AFB on 9 February 1960. Quickly, the OTS shadow fell most heavily on the Aviation Cadet and OCS programs. The Air Force waited for the OTS numbers to catch up - and then scheduled a phase-out of the earlier programs.

With the success of OTS, the Air Force OCS program was finally terminated 1 July 1963 after twenty-one years of service and over 41,000 officers produced. The final OCS class (Class 1963-D) of 119 was graduated on 21 June 1963. Interestingly, in a study of undergraduate pilot training attrition for 1962, OCS-trained officers
maintained academic, flying, and military grades equal to Air Force Academy graduates and superior to those of aviation cadets or officers from OTS and ROTC. Further, history has shown that many OCS graduates advanced through the officer grades to the rank of General Officer.