The logistics issue is most certainly not minor. Blacks had nothing to with physical and mental ability and homosexualty really comes down a trraditional stubborness of "icky." We are talking about a seperate category when it comes to females.
Consider also the cultural issue. Think in terms of generalities. People have sons and daughters. Which would they prefer to kick in a door to face a possible AK? It's just not a step our culture feels is necessary to defeat enemies. I'm all about women equality and such. I believe that if people look down through history in most civilizations, that they will find that women are the life blood of societies. But "equality" only goes so far when we start thinking about dropping females into situations where they will be on the attack on the ground against a male enemy that can easily overpower them in hand to hand. Here I have seen the argument that "hand-to-hand" isn't a factor of combat anymore. Yet, Marines saw the worst hand-to-hand fighting since Vietnam in Najaaf in 2003. Is America ready top place their daughters in a fight to the death against a man?