Just because I find it interesting, the Royal Navy for a very long time didn't do an oath at all (that said, the UK armed forces are charmingly diverse and I be

Just because I find it interesting, the Royal Navy for a very long time didn't do an oath at all (that said, the UK armed forces are charmingly diverse and I bet some of them did!), although non-officer Royal Marines did. I think I heard that non-officer Royal Navy recruits now do, but that was because the army and air force people did and it seemed silly to have the difference, so in the interests of being able to apply one system to all, the Royal Navy non-officer recruits now do, but there was no requirement for everyone already in to go back and do it, so now there's a navy in which everyone with more than X years of service didn't do any oath-swearing, and the new kids did. All something of a faff and taken as seriously as it sounds! I understand that in some nations, it's taken quite seriously.