|Light Helicopter Experimental|
In support of the LHX program the United States Army started the Advanced Composite Airframe Program (ACAP) to develop an all-composite helicopter fuselage. In February 1981 contracts were awarded to Sikorsky (for the Sikorsky S-75) and Bell Helicopter (for the Bell D-292).
In 1982 the U.S. Army started the Light Helicopter Experimental (LHX) program to replace UH-1, AH-1, OH-6, and OH-58 helicopters. This requirement was changed to a reconnaissance helicopter by 1988.
A Request for proposals for the new helicopter type was released in June 1988. In October 1988, the Boeing-Sikorsky and Bell-McDonnell Douglas teams received contracts for their designs. The program's name was changed to Light Helicopter (LH) in 1990. In April 1991, the Boeing-Sikorsky team was selected as the contest winner and received a contract to build four prototypes. Also that month the helicopter was designated "RAH-66 Comanche" by the Army.