Out of one side of men's mouths, you get this.

Another thing to consider: selective service. American boys are required to register for selective service when they turn 18, and failure to do so can have various consequences for them, none of which are good.

Out of the other, you get this whole comment thread which is arguing that women should not be on the front lines, period. Those in the comment thread also bring in an argument saying that women will try to get out of deployment by "getting pregnant"(both before and during), as if it doesn't take two to tango, and as if condoms don't exist and aren't readily available to anyone in the army.

(as an aside, it's generally been decided that it wasn't even a woman who wrote the OP of that thread - It was likely a man impersonating a woman online to say that women shouldn't be in the military)

Selective service cannot be discriminatory if the military is "for men only." Selective service is bullshit, but it's not discriminatory against men considering the general attitude of american men on women in the military.