My brother is a Colonel who he hadn’t voted in years. He said he was apolitical and answered to whomever was CIC. He did vote for McCain, but he said he didn’t think it would make much difference if Obama got elected. He was wrong and now he’s unhappy with Obama so he’s retiring. DADT did it.
BTW, he was on Petraeus’ staff.
The US is one of only a handful of countries that allow their soldiers to vote in elections. In most European countries, when someone becomes a soldier, they give up their right to vote.