One does not have to be a geneticist to know the “genetics” meme of homosexual origins has yet to be shown in any scientific study and numerous such studies have been done. Your theory is no more or less plausible than any other. But, consider the demographic. Homosexuals make up less than 3% of the population and more closely to 1 to 1.5%. I think the military can suffer the loss of representatives of such a small demographic. Unless, of course, your argument is that homosexuals are so demonstrably intellectually superior to all heterosexuals that we chain ourselves to perpetual mediocrity by excluding homosexuals for actively serving in our military.
I don't know if excluding homosexuals from the military would condemn our armed forces to a life of mediocrity. I believe our policies in Iraq and Afghanistan are currently doing a much better job of that so mediocrity may be what we get regardless of this gays in the military decision.
I saw reports where as low as 1.3% of Americans self identify as homosexual but self identification in our society as a homosexual is not something people are encouraged to step forward and do. Kinsey shocked the world by telling us in 1948 that 10% of males are homosexual and that 37% of post adolescent males had reached orgasm with another male (however time has shown Kinsey had sex on the brain way more than what you would expect from an objective researcher). Still looking across all the studies presented on Wikipedia (for what that is worth), I'd hazard a guess that 4.00% of the American population self identifies as homosexual and somewhere between 10-55% of men have had a homosexual experience.
Let's say these numbers hold true for the military. Since don't ask don't tell requires anyone caught engaging in a homosexual act to be discharged, then all who have had a homosexual act with another person of the same sex would be subject to the penalties. That means that presently, if people changed colors to purple once they had a homosexual experience, then somewhere between 10-50% or more of our military personnel would be discharged tomorrow...rendering us helpless against a world of enemies. Could an honest military suffer this kind of demographic loss and still protect national interests?
Mediocrity or not...if honor is what we expect from our military personnel and honor means honesty, then honestly we have a double standard going on unless every single study on male sexual behavior since World War II is wrong. Or are we to suppose that these studies are true in the general population but when you put thousands of men together for long periods of time and remove all female companionship then the rate of homosexual behavior between men drops suddenly to zero. I find that idea less than plausible.
Given all of this, natural or unnatural, learned or genetic, homosexuality is with us. It is in the military. It has been since Alexander the Great and the Spartans. It will be long after you and I are dust. Why are we asking people to lie about it? Why are we forcing individuals to whom this is perfectly natural to pursue lives rife with coercion where they can be blackmailed for being themselves and with that they can be forced to compromise security because they are not supported by the very country they have sworn an oath to protect. I think we all should lighten up and let these people come out of the sewers in which we've forced them to live.
We have done it for native Americans. We have done it for blacks. We have done it for women. Just because there is not a tell tale color or physiological sign post does not mean that they are all making a choice. If just one is born that way, then all must be protected...just as if just one fetus is a human being then all must be protected. We need to stop picking and choosing who deserves universal protection based on our own view of the world. Who among us truly knows God's plan? Who among us truly knows? Until we are 100% certain which cannot occur until we have returned to God's good grace, we should all seek to er on the side of abundant charity and good will, instead of condemnation and ostrecization.