Transgendered people have the right to defend their country, just like gay people.
Deal with it.
Military service is not a right, it's a duty. I don't have an issue with gay and transsexuals serving as long as they can perform the tasks (didn't have an issue with gay and chix with dix when I was in either), but having the perspective that the military is a social justice forum is dangerous.
Fat people have the same rights as everyone but we can't have them on the front lines. Paraplegics who got that way due to their military service have every right as anyone else but we cannot put them in an assault squad or in the rear with the gear.
This is the same thing. Anyone who CAN and WANTS to perform the tasks should serve, the key being that they CAN.