The U.S. has long led the world in stealth technologies, and for a time, it looked as though America’s love for all things low-observable would extend all the way into rotorcraft like the RAH-66 Comanche attack helicopterThe Boeing–Sikorsky RAH-66 Comanche is US Army’s stealth armed reconnaissance and attack helicopter designed for the United States Army. Following decades of development, the RAH-66 program was canceled in 2004 before mass production began, by which point nearly US$7 billion had been spent on the program.This Is the F-35 of Helicopters: Meet the RAH-66 Comanche