Gentlemen, I have a copy of the establishment of a Royal Marine Commando as it existed in 1976 including weapons, vehicles and detailed sub-units. Although I'm able to guess at most of the acronyms used, there are some that I have been unable to figure out. I've listed them here in hopes that maybe someone can provide their meaning for me. I've also given the context in which they were found. 1) MNE GD (MOA/RUNNER/OP) One is found in each rifle troop headquarters. I know that GD stands for General Duties and a Runner is, of course, a runner. I'm guessing that an OP is a radio operator and that maybe an MOA is a Marine Officer's Attendant? 2) MNE S3 and MNE RO Both are found in the signal section of the rifle company headquarters and in the signal troop. Is it signalman level 3 and radio operator? What's the difference? 3) Out of 9 Troop Sergeants 4 to be PW1, 1 to be PW1 (s), 1 to be ML1. PW is, I believe, platoon weapons but what is the significance of the (s)? I know that ML is mountain leader. 4) UIRO What does this stand for? It has a Sgt GD (RI). What is an RI? 5) MNE GD (D) (C) Three such marines are found in the intelligence section. Do the D and the C stand for draughtsman and cartographer? 6) RO, LV, RO/LV, CPR (1 to 3), CQ (1 to 3), D (1 to 3) and S/Man D, I'm guessing, is for driver. The rest I'm not sure. 7) Instr Officer and Yeoman What are the meanings of these two positions within the context of the RM? To anyone who can help, and doesn't mind answering questions from 33 years ago, I would surely appreciate their assistance. If, on the other hand, the answers are so blatantly obvious that any fool should have been able to figure them out, then I ask for your patience. Cheers, Dan.