Helicopter technology hasn't progressed much...especially attack helicopter tech. The S-67 was going to be the "American Hind"...check this out from Wikipedia.
The Sikorsky S-67 Blackhawk was a private-venture, prototype attack helicopter built in 1970 with Sikorsky Aircraft research and development (R&D) funds. A tandem, two-seat aircraft designed around the dynamic drive and rotor systems of the Sikorsky S-61, it was designed to serve as an attack helicopter or to transport up to 8 troops into combat.Industry delivers, but the armed forces fail to bite. Across the board it seems that aviation developments have stalled...we're just a step ahead of where we were in the 60's and 70's design wise. By design or because of budgets?