From Wikipedia:
"Lockheed designed the Cheyenne as a compound helicopter, which combines a helicopter with fixed-wing features for increased performance, usually speed. The design included features such as a rigid main rotor, low-mounted wings, and a pusher propeller. Thrust was provided by a pusher propeller at the rear of the aircraft. " Boeing is proposing an advanced Cheyenne, combining a tail rotor with a pusher prop. Bell an advanced Comanche. Sikorsky is not a lock here.