Gary M:

U.S. Squadron 50 submarines used the US/C-3 RCA MI-2558 clandestine submarine
commando operations signaling device during "Operation TORCH" and during landings in the Pacific theater. This transmitter was attached to the top of the 12" signaling searchlight.

I rode a 2200-ton destroyer, the USS WILLARD KEITH (DD-775) in the Pacific theater, and she used these infra-red devices on her 12" signaling searchlights on port and starboard sides of the bridge. They were plugged into a 110VAC outlet nearby. A 6" infra-red adapter was attached over the front of the 12" light.

Hope this helps,

ROBERT M.