Brief Thought (or, The Battle for Gay Marriage)

As a side note to my previous post:

In this modern era, where we allow those of non-heterosexuality to serve in the military, albeit in secret, protecting the rights and freedoms of others, why is it we can't allow them the indulgence of marriage?

I don't care about the definitions religions apply to marriage or the 'survival of the species' mentality that marriage serves to produce offspring (which, honestly, marriage or not, that's solely in the realm of sex)... it's a union between two people connected by love and affection, no matter how you look at it.

And, honestly, isn't the "Pursuit of Happiness" one of our inalienable rights as American citizens?