The RAH-66 Comanche helicopter was designed and built by Boeing-Sikorsky.
The Comanche helicopter is used for attacks designed for the United States Army, they are manufactured by Boeing Helicopters and Sikorsky Aircraft Corporation.
The RAH-66 Comanche Helicopter, however the project was canceled because of the cost.
On February 23, 2004, the U.S. Army announced their decision to cancel the Comanche helicopter program in view of the need to provide funds to renovate the existing helicopter fleet of aging attack, utility, and reconnaissance aircraft. Also a factor was the growing popularity in the military of using unmanned aerial vehicles (UAVs) for reconnaissance purposes
An attack helicopter is best for attacking targets and a utility helicopter is best for carrying troops and supplies.
Look on google images (link below)
The Apache may be the best "attack" helicopter but the Navy MH 60 S is the most diverse platform and best utility helicopter in the world.
America's first designed & built attack helicopter was the AH-1 Cobra fielded in the Vietnam War. Note: Any chopper can be called an attack helicopter if its armed for the job. Consequently the terms "designed & built" specifically as a gunship (attack helicopter).
the Answer is Yes
The RAH-66 programme was canceled in 2004.
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AH-1 Cobra; the worlds first designed, built, and fielded in battle attack helicopter in 1966 (Vietnam War).