Because of the "Troubles" in Northern Ireland it was forbidden for many years for service personnel to appeal off duty in their uniforms in the UK. I'm not sure whether that applied to cadets though! I went through San Diego airport one President's Day weekend and there were dozens of US Navy guys in full dress uniform with little peaked caps and all, it was like "Top Gun" or something. We are no longer used to seeing them around. But then, our police officers and nurses don't seem to do much of their supermarketing in uniform, either.