If I were you I would go to XJT they have IAH and DFW. They also send a lot of guys to United. They have good rsv rules I've heard. Envoy is negotiating theirs so you could wait and see what they get. Being military your United app would probably be scored the highest coming from XJT.

I cant imagine AA hiring you through the front door if you go to Envoy, I've always wondered if them having an official flow for the last 20 years has caused other carriers to limit the opportunity they receive because they've always had their opportunity with American.

Delta seems like they shine a flashlight so far up your *** they wanna know what you were doing waaay before you were ever thinking about going to Delta. So they can get a "clear" picture of you, not the white washed version you will present at the interview. Good news is what's done is done, out your hands now with them, you either have what they want or don't.