One aspect that needs to be understood is that although there is an RPA school, the AF has at times forced students at UPT bases to go RPA (drop night). It was only a couple of yrs ago that all of the UPT bases, except ENJJPT dropped 2 RPA slots per class for entire yr. They announced this action very short notice. The students of the 1st class that dropped RPAs were informed about 2 weeks prior to drop night, needless to say there were students very unhappy because for a yr they thought as long as they graduated they would go fixed wing only to find out at last minute that would not be true.
Just saying that even if you get UPT there is a chance that they could still send you to the RPA world out of UPT. It comes down to the needs of the AF. It is like a pendulum. The AF tries to keep it in balance, but sometimes it swings.
I will add that in a course of about 6 yrs they did this 2x. My DS winged in 14. His was the 1st class to have no RPA drops. I want to say the one that did the 2 RPA drops for a yr., occurred about 3 yrs ago. They were losing RPA pilots at a higher rate than they could replace them, plus at the exact same time although the UPT world was running at 110% rate, the backlog was long not only for UPT class start dates, but at the airframe school houses. It was not uncommon for the sims to be running 24/7 6 days a week. Thus, to help the fixed wing school house world with catching up, and get more RPA pilots, Big Blue figured pull them from UPT.