Commissioned into the Fighter stream in 1979, the Air Marshal has more than 4,000 hours of operational and training flying.
He had held various important assignments at various stages of his service.
The Air Marshal has been a Fighter Combat Leader, A2 qualified instructor and Directing Staff at TACDE. He is an alumnus of Defence Services Staff College, Wellington.
Air Marshal Deo was Chief Operations Officer of a frontline forward base and commanded Air Force Station, Jodhpur.
Prior to taking over as Air Officer Commanding in Chief of Western Air Command, he was Director General Air Operations at Air Headquarters and Air Officer Commanding in Chief of Eastern Air Command.