You know, Simon, you've almost got the accent nailed down perfectly.
Realizing that I'm coming at this from the simple infantryman in the ranks perspective: other than the chance to wear a cool uniform, what is there really for a foreign observer in the reenacting world? At a living history, you might be able to interact with the public in either a first or third person fashion, but you're talking about an extremely specialized and small slice of the conflict. At a non-spectator event, can you keep a first person going for a day or two? You're not going to write a book when you get home. Officers who don't know you aren't going to invite you to dinner because they want your cool cache. Newspapermen aren't going to interview you because they want your perspective. I read the above post from the guys who were trying to act like observers while observing. I think they did a good job, but I found myself asking: how was the event enhanced by this impression? Staying out of the way and observing from a distance sounds like one step removed from invisible. I'm not trying to pick a fight, but I really don't see this impression as much beyond a money pit.
Pine River Boys, Co I, 7th Wisconsin
"We're... Christians, what read the Bible and foller what it says about lovin' your enemies and carin' for them what despitefully use you -- that is, after you've downed 'em good and hard."
-Si Klegg and His Pard Shorty