The MTP programs are primarily derived from the TWI "J" programs. Starting in 1941, the TWI Service began to train the functional branch of the military that supported the active service - Services of Supply - SOS. Based upon the success in SOS (later named Army Service Forces - ASF), other branches of the military adopted the programs.
In late 1943, due to cuts in TWI's budget, the military were forced to develop their own training independent of TWI. However, many groups continued to maintain their relationships with the TWI District offices.
In late 1944, the Army Air Forces (AAF) reformulated the TWI programs into a general supervisory training program - even specifying which classes were available for credit towards each particular "J" program.