The RAH-66 Comanche was a Boeing-Sikorsky stealth reconnaissance/attack helicopter prototype that first flew on January 4, 1996. The program was cancelled in 2004 after billion in development costs without a production order, but the unmistakable faceted-fuselage stealth silhouette remained an iconic image of late-1990s Cold War-era helicopter design.
A full description for RAH-66 is on the way. In the meantime, you can fly this helicopter right now in the Absolute RC online flight simulator.
A helicopter scale subject for rotorcraft practice.