Any guest service place, as you need to show your military card to show you are entitled to that ticket. May be able to do it in the ticket office inside the Universal hotels, too. I did military tickets one time, and got them at the guest services outside the Studios. I’d try at the hotels, as can be a pain to wait in a long line that sometimes occur at guest service places.
Nice deal, that am I glad Universal supports the military. And thank you for your service.