Back in 84/85 I was a liaison to the Royal Marines, I was a U.S. Marine Air Naval Gunfire f/o. I believe you have a picture of a squad or platoon level O.T.I.S. (tripod mounted) they were used as a RECON tool and to assist anti tank crews. I'm sure they were used in the Falklands, not sure about Northern Ireland. Not much help to you, but brought back some memories.