This Day in Aviation History
August 20th, 1970
First flight of the Sikorsky S-67 Blackhawk.

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….

Wikipedia, Sikorsky S-67 Blackhawk:

YouTube, S-67 BlackHawk Wings Gunship Recon Team Insertion:
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