There is no question that the real intent of lifting this ban is to harm our military. The people pushing this are the same people who have no problem banning the military from college and high school campuses. Just by definition they aren't looking to strengthen the military. They know it's going to cause problems simply to have openly gay troops, but what I believe they're really counting on are the extreme behaviors doing the damage because they'll be argued as part of being gay and therefore protected.
The only ones that are not signing up now are the ones for whom openly flaunting their perverse lifestyle is more important than serving their country. We sure as hell don't need them.