It is awfully arrogant to assume that if one has those traits that one tends to be conservative, or Republican for that matter if you go by party affiliation. Or that the military has a monopoly on hard work and well educated, I am certain the employes of Google ad countless other companies would disagree. Plus, you can't exactly quantify 'hard working' or 'well read'. I didn't see copies of the paper or War and Peace sitting around the squadron that often, usually Sports Illustrated or Maxim. And the smoke pits or Goat Locker aren't exactly hotbeds of hard work.
Here is some interesting Gallup polling on veterans and active duty political affiliations. I believe they are a little more reliable than the Military Times polling that is often cited by many, since Military Times subscribers are are more likely to be more senior and careerist and are in fact in the minority in the military. While veterans and active duty skew a little bit more Republican it is often not as 'overwhelming' as many believe.
I really don't want to wade into the swamp that is politics on the internet but I think the gallup poll is perhaps a little suspect. The closest the two graphs come to meeting are the age groups that would have been subject to the draft and therefore more representative of society as a whole than years of volunteer forces. It should not come as as shock to anyone that most militaries the world over are fairly conservative organizations. If perhaps the ivory tower of academia would allow god forbid an ROTC unit on campus the graph might even out a little in peace time but don't hold your breath.
As far as Iran goes does anyone seriously think that there is even a semblance of democracy there? I am sure public stonings are a real impediment to getting to the polls.