I got out of the military over 20yrs before Don't Ask Don't Tell was enacted so have no experience with it personally. I've worked with ex-military that served during DADT and judging by the homophobia displayed by some, it must have been hell to be gay in the military. Seemed like the more religious, the more homophobic. One theme that kept coming up was their not wanting to have to shower with gays(a secret fantasy maybe??)
Anywho, like I said, I wasn't in during DADT. When I was in being gay was a way to get out of the military and during 'Nam that was something to be desired. Of course, proving one was gay was not easy, one almost had to get down on his knees and blow someone. There were enough guys trying to get out that it was hard for anyone to get discharged before their hitch was up. It was easier to get discharged because of a mental problem. One guy I knew went to the doctor and complained about not being able to sleep and got sleeping pills. They caused him to oversleep and be a couple hours late to work. After several months of him being late a number of times and even being reassigned to a job with a later start time, he was finally discharged.