He could be (though very unlikely after he missed 10 years of service), but I'm not sure what that has to do with it.
He could have a desk job, I suppose, but he doesn't strike me like a desk person. And honestly, I'd have to assume Robin Masters is long gone now and that he'd want Thomas to have the house. They could also have him only appear in the pilot and then play up the fact that he's never home, just like Robin Masters.