Just noticed that the American Anthropology Association finally produced a statement on the US Military's Human Terrain System (which recruits anthropologists to assist their 'progressive' efforts in the regions they occupy).
I'll redirect you to two responses from fellow AnthroBloggers for all those interested:
In favor of and prolific posters on this issue: bloggers over at SavageMinds.org
Opposed to: the blogger(s) over at Anthropology.net
I'm still on the fence with this issue, since I'm a prospective AFSA with an undergraduate degree in anthropology...
But I think Marx's famous quote could be pertinently changed to:
"[Anthropologists] have only interpreted the world, in various ways; the point is to change it."
In my opinion your not going to change military policy and actions by writing in subscription journals and if you truly want to stop the egregious acts and culturally detrimental actions of the military you have to actually get engaged with it, learn the lingo, embed yourself within it, so you can not only understand it, but hopefully teach it the vaulable lessons that anthropology has uncovered over the years.
But that's just my two cents...it's a very tricky ethical question (as all ethical questions usually are).