To me, the general idea of what the military tries to do is not to create sociopathic (antisocial) behavior, but to strengthen pro-social behavior within one group ("us") combined with lack of empathy for another group ("them") and desensitization to violence.
The thing about sociopathy is that in general, there's no idea of "us vs. them," it's always going to be "me vs. them" and "them" includes the soldier next to you as well as the enemy across the field. I doubt a sociopath will feel the sense of group unity that most soldiers are expected to feel.
Basically, I think that a soldier is expected to act empathetic/pro-social toward fellow soldiers and countrymen, respectful to authority based on rank alone, and non-empathetic/dehumanizing toward the enemy soldiers. I think the last thing on that list could be considered a "sociopathic trait," but I think that the other two aspects are crucial enough to a strong military that they would not want to create pure sociopaths.
I also agree with what Frosty said that there are most likely some sociopaths involved in the military. In general, I think that a sociopath is more of a mercenary type than an enlisted soldier type.