>>640805
>1st generation stealth platforms (F-117 and B-2)
You're forgetting the Sea Shadow. It stand to reason they would have at least tried to make a transport helicopter since they did have a program for literally everything else.
The thing they all have in common is that THEY DON'T WORK.
My guess is the helicopters stayed under wraps is:
1.) They work. Stealth planes are a fucking gimmick that is at best a good support for SEAD missions and it's kinda inexpensive for ships, so why not. However the discreet insertion of commandos through helicopter is a real thing with normal helicopters, having an helicopter with noise reduction (there a lot of Vietnam era research into that) and radar reduction, combined with advanced instruments for night flying and very low altitude flight is something very desirable. And if the US did make a breakthrough in both (and we know they did due to cold war documentation on the subject) it stands to reason it's still secret up the ass.
2.) There isn't many. The thing reeks of small scale skunkworks, they might be operated by people from the 160th SOAR but they're certainly NOT USAF property.
People have forgotten but the original stealth and spy planes were never bought and built through the US armed forces but via the CIA. The same is true of the original MD500 that were heavily modified in what is today the "Little bird", those were Air America custom orders to much smaller workshops that would order from Hughes and then modify them.
Making custom works for let's say a dozen (maybe only 4) is far much easier to do in secret than trying to get Congress to fund an entire part of the air force.