I was recently reminded of a little known group....little known to me that is...no doubt some of you will know it, to others it might come as a surprise something of a CAF of the Vietnam-era.
The Army Aviation Heritage Foundation owns and flies a number of historic fixed and rotary-wing types used by the US Army in the 50s-70s.
Their collection includes a rare military marked De Havilland Canada Caribou and Grumman Mohawk...as well as Huey and Corba and other helicopters.
Check out their website
http://www.armyav.org/board_1.htm