Some more good reads for rotorheads:
Aeroscouts, by Charles Holley
http://www.amazon.com/gp/product/0671760556
Dustoff, by Michael J. Novosel (MOH winner, former WW2 B29 pilot!)
http://www.amazon.com/gp/product/0891418024
War Pilot, by Richard C. Kirkland (WW2 fighter pilot who switched to choppers)
http://www.amazon.com/gp/product/0345458125
All good reads.