The SCR-584 was so successful that it was adapted for use by the United States Navy. "CXBL", a prototype of the navy version, was mounted on the carrier USS Lexington in March 1943, while the production version, the "SM", built by General Electric, was operational on the carriers USS Bunker Hill and USS Enterprise by October 1943. A lighter version of the system was also developed, the SCR-784. The only real difference was that the new design weighed 12,000 lb, whereas the original was 20,000.