I think that it would be better to understand what a “right” is. I am disabled, there is no right for me in some circumstances to serve, this includes the military. The military is not a place for the rest of the troops to hold my hand or carry me around, it would place the other soldiers in serious danger to have to take care of me. Now, while I do perform great in other ways, that’s fine, but I do not by any means have some special entitlement to get into the military, and I have my honorable excusal from serving, especially in combat duty.
As far as you asking for examples, I have some, but those of us on FreeRepublic could tell you better from the military experience. In the military, you have little privacy with other men, or others of the same gender. You share rooms, you shower together, etc. The last thing you need is to add additional special privacy obstacles to provide for someone who is gay. The last thing you need when you are in serious combat duty is insecurity about your fellow soldiers who you are in close quarters with most of the time.
Again, take the word of someone on FreeRepublic who serves in the military over mine, they’ve got the actual experience.
Does my 8 years plus count then?