How is it relevant if she was a Lesbian?
We just had an end to Don't Ask Don't Tell. A lesbian would have been dismissed.
Before 1993, when Clinton passed DADT homosexuality was totally banned in the military. So, yes, it would have been relevant since a homosexual would have lied to join and lied to stay.
Well I don't know too much about the rules back than since I was not in, but I thought you could only get thrown out of the Military for actually commiting homosexual acts? I worked in Separations and I saw a few women discharged for having sex with other women, and not all of them were gay, one of them was married as a matter a fact.
If she was having sex with another woman, yes she was a lesbian. Even if she was married.
Not that there is anything wrong with lesbians as people They shouldn't lie about it, nor should they expect concessions for it.