Most soldier's want a blade that will cut for a long time without having to be sharpened
can be abused and not to big ie
9" or under OAL .
S30V or S35VN or CPM154 is what I'd want in the field .
Coated or a rough satin finish, stuff does rust over there very easily from the slightest moisture. .
A primary edge that can be touched up with a pocket diamond sharpener would be good since the average grunt isn't going to be thinking about sharpening his knife often.
It should be tough enough to take abuse but still light as possible since every ounce counts when your climbing mud walls and jumping over wadi's all day.