The Commanche was a program for a scout attack helo and looking at its design it would not have been good for flying in troops... but for shooting the living daylights out of everything in sight... What may have happened is that they have used tech from the program on some Blackhawks to make them stealthy. Also when a Helo is flown Nap of the Earth picking it up on Radar is extremely difficult if not impossible if you are under the curvature of the earth as these guys would be as the route in would have been planned to avoid most Radar systems or at worst to lessen the chances of being picked up by them. The only reliable way to paint a Helo NOE is from above with an AWAC or the helo practically being on top of the Radar site. Tech from failed programs is often recycled to enable other program's to be more effective... like the TSR2 Engines and Concorde.