In a rollout ceremony last week, Sikorsky revealed the finished prototype of its new light helicopter design, the S-97 Raider. The Raider is a radical departure from most other American military helicopters, featuring a co-axial rotor design featured on Russian helicopters like the KA-50 Black Shark, as well as a compound helicopter pusher rotor reminiscent of the Army’s canceled AH-56 Cheyenne gunship project from the 1970s.