In 1957 in a Co class destroyer the Lower Deck was run by a CPO coxswain. Nine years later a Leander with roughly the same complement rated an MAA. Anybody know why the change? To my mind thismeant that a useful path of advancement for seaman Senior Rates was closed off and enhanced promotion possibilities opened for the Regulators. At the time PO to CPO for seamen was dreadfully slow and if a seaman didn't get PO pretty early he could end up going to pension before he got his buttons, which did not seem like a good idea. If he did get CPO his counter was home and he didn't have to over-exert himself thereafter .. just spin along to his 22 .. although of course many were made of better stuff.