chaimss –
Please clarify. Does not the military have the right to reassign you in a time of conflict (i.e. another Iraq, G-d forbid) to a combat position should it deem it necessary? If so, Pikuach Nefesh is an issue. I believe (but perhaps am mistaken) that the U.S. Military can, at will, reassign Officers to combat positions.
I don’t quite understand your point about a ”Chaplain.” And yes, any way you cut it, the U.S. Military is a non-Jewish service, and it risks its soldiers lives based on values not (necessary) in conformance with the Torah.