Awsome emotion provoking photos dude. I went to see the vietnam memorial a few years back and these pictures gave me the exact same feeling that I got when I visited it. That's the mark of a great pic.
Just a suggestion though. I would've bumped up the apeture a bit in the first two photos to combat that blurryness. Sometimes it's cool, but I don't think it works that well with those two particualr photos. With such sharp contrast and clarity of those black and whites, it kind of seems out of place to have that degree of out of focus. Ah well, just my .02.