The history of Air Mobile Operations by the US Army makes for some interesting reading if you enjoy politics....and bureaucratical in-fighting.
General James Gavin (of WWII Fame as CG of the 82nd Airborne Division) was a strong advocate of Helicopter Cavalry and strong support by SECDEF McNamara led to the 1st AirCav Division being formed for service in Vietnam with excellent leadership by several Army Leaders.
I know General Tolson...shared a pickup truck seat with him after having to land out due to bad weather on a flight from Charlotte to Raleigh, North Carolina. Seems I had one of the infamous "Tactical Instrument" ratings that were not worth squat back in the land of the big PX. Karma is great as Tolson was one of the major players in that decision...taking short cuts on our training and not having us obtain a Standard Instrument Rating.
If you run out of hot milk and need a good read to put you to sleep....
Airmobility 1961-1971