Mike.
British armed forces in South Vietnam during the war also included both Royal Marine SBS, and Army SAS. Their SAS out of Malaysia were in fighting areas associated with the LLDB, Luc Luong Dac Biet, the South Vietnamese Special Forces, in 1958 / 1964, and later with ANZAC in the central highland zone doing a claimed “observer – advisory” role.
The Marine SBS conducted a similar role in the Rung Sat Special Zone with Riverine forces, SEAL, SOG, and the Coastal Surveillance Task Force. It was not unusual to come across an occasional British Warship lying off the Delta coast in my time 1967-68. Hell, they even gave us what they termed “Pussers Rum” as a welcome if we went alongside, which was something we had been ordered not to do but chose to ignore on the basis of good allied relations. Anyway, Royal Marines are automatically associate members of our association, just as we, the US Marines, are of theirs.
Take care,
Bernard.