Before the RAH-66 Comanche, there was the LHX (Light Helicopter Experimental) program of the 1980’s. Initially the need was broadly defined, and companies such as Bell interpreted it to include the possibility of single-seat combat tiltrotors. The Bell Advanced Tiltrotor (BAT) was one such design. It was design for battlefield surveillance, ground attack/anti-tank… and for blowing Soviet Hinds out of the sky. Whether a tiltrotor could be made that could be safely handled by a single pilot while doing all that craziness is far from certain, especially with 80’s-tech, but the design was certainly appealing. Unlike attack helicopters and F-18’s, the BAT could escort the V-22 on its missions.
Clearly the overall configuration has a great deal of similarity to the XV-15 and the V-22.