So only people who openly identify as “gay” are allowed to join the military… okay… besides the problem that you’d be short on recruitment for your needs, and besides the fact that you’ve grossly misrepresented Spartan culture, the problem here is every bit as deep as the “straight only” policy.
To begin, what are you saying? That only people who engage in homosexual activity are eligible for military service, or that only people who identify as gay can join? Does occasional, incidental, or frequent heterosexual sex disqualify a gay person? Is it the sexual acts that a person regularly performs or ever has performed that make them “gay” in your eyes, or is it the self-ascribed label of “gay”?
I am a male, and I have had boyfriends. Can I join?
Oh wait… I currently have a girlfriend… am I out?
But the last person I had a sexual encounter with was a man… am I back in?
Oh… but he wasn’t “born” a man, and though he looks and acts in the style of men in our culture, he has a vagina. Am I in or out?
Sexuality and gender are way more complicated and nuanced than anyone here has acknowledged. People simply do not fit into tiny boxes, and policies that act as if they do are asinine.