Well, whaddaya know. A recent study chaired by four retired American officer finds that gays and lesbians do not hurt cohesion in their units. The rebuttal, according to this Army Times article, consists of the circular argument, "Because we think gays might hurt unit cohesion, we frown upon them serving in the US military, which is a nudge-nudge wink-wink way of saying that discrimination against gays is OK, because it might hurt unit cohesion."
You'd think that someone whose job is to train and lead people to do extraordinarily difficult things, such as advancing under fire, might be able to rise to the challenge of saying, "Knock off the faggot jokes already. The guy you're scared might covet your ass is more likely to save it some day soon."