 Brigadier John Vaughan Bruce Jervis @-@ Read OBE was the original head of Ops ( B ) . He had joined the Royal Engineers from university as a second lieutenant in 1933 . By March 1942 , when he was appointed head of the deception section , he held the rank of colonel . His main task was the planning of Operation Cockade . It was not a success , in part due to the complexity of the operation , but also because of the limited resources at his disposal . Lieutenant General Frederick E. Morgan , at that time the most senior officer at SHAEF , the Supreme Commander having yet to be appointed , viewed Colonel Dudley Clarke 's A Force as a " private army " which he would not have duplicated under his command . 
