If it's not American you don't check/care. A simple Google check would confirm uniform of a Royal Marine and Royal Navy Sailor/officer. Also its the Royal Navy, you don't need the prefix 'British'. It's not the first time in the NCIS franchise that you've got simple things wrong, you need to do your due dillegence. That said the US bravdo is easy to understand, but confusing rank, uniform and an appalling making of 'tea' is reprehensible. You're better than that, come on, dig deep and do the research, it will pay dividends in the end. I love the show, but sometimes you've more bull than Texas; and tea isn't something you just throw in a harbour.