I have the DTS Pvt Ryan (which is my standard for showing off audio) and the Bitstream of Blackhawk Down in my collection. I was going to show the latter since everyone's already seen the former. We were also going to do Flags & Letters together, both of which I realize aren't typical war movies (throw in Thin Red Line and you've got a really unusual mix, eh?), but our little group has mostly military history buffs who've been to battlefields, read the books, etc., rather than are just looking for big explosions. But I figured if we're going to watch the stuff, I might as give them the best show possible.
Cheers,
Kevin