This stealth helicopter was awesome right up to the point the program was canceled
Heat, smoke, and that loud "wop-wop" sound make helicopters easy targets on the battlefield. For these reasons, helicopters make the unlikeliest candidates for stealth technology. But during the 1990s and early 2000s, Boeing-Sikorsky challenged that notion with the RAH-66 Comanche helicopter.
The Light Helicopter Experimental program is the brainchild of the U.S. Army. It charged Boeing-Sikorsky with developing armed reconnaissance and attack helicopters. The result incorporated stealth technologies that minimized radar and human detection. It used advanced sensors for reconnaissance intended to designate targets for the AH-64 Apache. The helicopter was also armed to the teeth with tucked away missiles and rockets to destroy armed vehicles. Two prototypes were built and tested but the project was ultimately canceled in 2004.
This video shows awesomeness of the RAH-66 Comanche helicopter in action.