Evening all, I'm after a bit of advice, if I may, on the correct form for writing an introductory letter to a regiment. It is to the Adj of a guards regiment who is the brother of a friend. I've passed main board and will be going to sandbags in sept, so this is the first step in introducing myself formally. What I'd like to know are tips on how to address and word it so as to avoid any faux pas. Any pointers appreciated, thanks.