You bring up a good point here in regard to the ratio of men to women in the military. On my ship, an aircraft carrier, there were ~600 women and ~5000 men. My division had 25 people, at any one time 3-5 of them were women. Consequently one of those women was gay. There was a guy, he was married, but I was fairly certain he was gay. For us there was never an issue or incident related to male-female or straight-gay or gay-gay relationships.
For all this talk about what the military is like, for me it was like working in an office/industrial environment. I had no problems trusting anyone based on their sex or sexual orientation. The lesbian woman was one of my better friends, one of the hardest workers and had the most positive attitude/morale of anyone else in the division. She re-enlisted and was assigned as a Recruit Division Commander (RDC) which is what most people know as a drill instructor. She is a highly valuable part of the U.S. Navy. It was no secret that she was gay. No one cared.
I've heard plenty of stories about people "coming out of the closet" to avoid going on deployment. They all end with the person being laughed out of the office and told to get back to work. As far as I could tell there was no such thing as DADT. The sky never fell and my ship never sank.