Here are a few "logistical" items to consider....
The military is very gender specific. seperate male and female living quarters. It's consuming now to have multiple living facilites for both sexes. Now if you were to add in gay men and gay women now you need to create 4 seperate and equal living areas for each class.
Males and females are seperated for obvious reasons, but how would gay men and women be seperated? would all gay men barrack/dorm up together (same as straight men and women) ? Would that cause distractions for that many homosexual people to be living together in such close quarters? (which is why straight men and women are seperated)
This whole concept doesn't sound all that much of a big deal to civilians, but when you realize and think what the military actually is and does, it's not easy to carry out on a budget or in some far away austere location. logistically how would this work?
A whole "nother" can of worms, would be the concept of "domestic" partners being covered under government benefits (ie. GI Bill, death benefits, health and medical benefits, etc..) that straight married spouses are entitled to. what would be the criteria for establishing that? Not for nothing, but that's also a HUGE chunk of money out of their operating budgets to make another group eligible for those benefits.
Thats just my .02 cents on the logistical aspect of this policy, if i post back later or tommorow i will elaborate on my thoughts of if it will work, will it work, good idea/bad idea.