I may be wrong, but I suspect that a major reason behind the military's "don't ask, don't tell" policy is the fear that a large number of current members of the military are so homophobic, that they will leave the forces in droves if gay members are allowed to serve openly.
You know what? I'll bet that when the issue of integrating the military came up, one factor that delayed that was a similar fear: a worry that racist soldiers predominated, and they couldn't take the chance of having the army decimated by people leaving because they refused to serve alongside Blacks.
But in retrospect, that didn't happen, did it? I believe that if the Pentagon will take the big leap and admit that the military has many gay members in it who are serving honorably--and should be allowed to serve honestly as well--NOTHING MUCH WILL HAPPEN.
At least that's what I think.