Prior to GW1 my mate got a big brown letter from PMC as it was then, we debated over what it was as he was on active reserve having just left and was experienced on several types that went and current by a few months on one, in the end after talking about it, we came up with if you haven't read it how can they do you for not responding to a reserve call up, so the letter sat propped up on his desk for months
when eventually opened it turned out to be forwarded on mail lol.