I would be very surprised if the military (even in emergency situations) did not routinely screen collected blood for Hepatitis B, C, HIV (multiple strains) and syphilis, as they do routinely in the Red Cross.
My husband served in the Navy for 9 and 1/2 years, and he was routinely tested for AIDS. Just par for the course.
He was a submariner, and he did know of one submariner who was gay. No one had an issue with it, truly. The man kept things mostly to himself. My husband was one not to kiss and tell about his life as a heterosexual... and the same was true of the gay sailor.
I often think in life that discussing sexual preferences is uncouth... not because of a distain for homosexuals. But because I have never found a need in life to continually pontificate on the issue that I am heterosexual. I don't discuss it with others. My personal life is my own and off limits to discussion.
Isn't this a more civilized way of handling ourselves as human beings?