In 1943, the Unit was transferred for administrative purposes to No. 28 Group RAF under RAF Technical Training Command. Additional courses were added for Security, Air Intelligence for RAF Bomber Command, a Far East Course and Air Intelligence for Senior Officers. During the period from November 1939 to September 1945, 7,086 Officers of the British Services (including dominion and Allied Forces attached to the RAF) attended over 372 courses. In late 1944, the school was hit twice by German V-1 flying bombs causing damage to the buildings and injuring a number of staff.