I've always feared serving in Russian military because I've been told by friends that once you go to the army, you don't come back the same. Since I've always hoped for a career in science or research and development, I couldn't see myself coming back from the military service with a destroyed brain. Perhaps it's not so scary and most people come back fine.
However, in reading a recent NYTimes article about crimes being committed by the US veterans of the Iraq war, I found a startling quote,
-- “They break down your mind, and then they try to build you back up,” ... -- “Into a killer?” ... -- "Yes."
http://www.nytimes.com/2008/01/27/us/27vets.html