For a quick read on the problem of sex in the military, see this 1996 piece from the New York Times, by Eric Schmitt. It shows the usual NYT bias, but nonetheless gives a good sketch of the problem. For a longer and more substantive brief against coed basic training in the military, see the following 1997 report by James Anderson of The Heritage Foundation. Notable here is the link between coed training and sexual abuse, as well as Anderson’s pointing to the Marines as a model. The Marines are the one service that still segregates the sexes during basic training–and it works. Finally, for a superb book on the problems of women in the military, see Stephanie Gutmann’s, The Kinder Gentler Military.