Are most people who are in the military on the right side of the political spectrum? Its always appeared to me that was the case. But it that were the case, then consider the following:
Throughout history, there have been numerous times where conservative ideas were being dropped for more liberal ones, which were becoming the norm, and more than often, there were violent conservative reactions to this. The Gracchi Brothers and Julius Caesar were assassinated for trying to bring in new, liberal ideas. Mussolini founded fascism as a response to the growing threat of communism. Both the Republic and Fascists, of course, failed.
Now what I don't quite understand is, assuming that military people are more likely to be conservative, why is it that conservative reactions often fail? The military, which appears to me anyway as being more conservative, is usually the most or second to the most strongest force in a nation. Why would military men be willing to help someone bring in more liberal ideas? Consider how Lincoln led the north against the south to prevent secession, but eventually included abolishing slavery. Why wouldn't a huge faction of Lincoln's army quit when their leader begins spreading ideas they are against (that is, once again, we assume most soldiers and military personnel are conservative)?