To build on Teddy’s point, this is hardly scientific, but it’s notable that when the commander of the Army’s 10th Mountain Division asked his officers and soldiers what they thought about repealing DADT, many if not most of them considered it long overdue. The 10th Mountain is one of the most combat-deployed divisions (though since what, 2005, we’ve been counting by brigades and not divisions) in the Army since 9/11. I would suggest the two facts are not unrelated.
It’s been said that wartime is no time to get rid of DADT. It might be the best time. A combat-experienced military learns very quickly that it has no time for trivial bigotries. It requires the most competent and professional people possible. That’s why a mission-first ethos naturally leads to an antipathy for DADT. And who’s more motivated for the mission than people who want to serve so badly that they’ll currently suppress an important aspect of their identity because of an older generation’s sensibilities?