A CBS station in Birmingham says that the Defense Department reports a military divorce rate of 2.6% in 2001, and 3.6% in 2009, but that it did not go up any higher in 2010. (A major RAND study in 2007 had described the increase as gradual and unrelated to deployments -- at that time the rate was 3%, which it pointed out was the same as in 1996.)
Breakdown by gender: it says that in 2010 "7.8 percent of women in the military got a divorce, compared with 3 percent of military men." That's consistent with earlier figures.
But the article also acknowledges, "A big reason for the plateau could be the military's recent proactive stance to lowering these divorce rates. There are several programs offering marriage support. A recent study showed that couples attending one such program suffer 33 percent fewer divorces than those who do not." More detail on that here.