Only countries were foreigners are enlisted wholesale into divisions have an easy time doing what you suggest. The Soviet Union used foreign troops to suppress populaces because they knew that by so doing they wouldn't create a conflict of interest in their troops. The US has a citizen army for a reason.. it makes attempts to use the military that way MUCH more difficult. Morale is important in military.. and what you suggest would crush it. What you do NOT know about the military could fill volumes.