The Stealthy Blackhawks were accompanied by Chinooks twere they not? Seems to recall most the SEALs were extracted by a Chinook after the crash of the one Blackhawk.
In my post....I was not referring to true "Stealth" ala Radar cross section but rather to it being a bit quieter than perhaps its gun cover like the Cobra, Harrier, for instance.
I am not all that convinced of the quietness but to my tired ol' helicopter pilot ears....it did seem so....although they are noisy. Anytime you get all those blades beating the air into submission there has to be some noise made.