I can say with certainty you will get flown down there if youre going Marine Corps OCS route. Before you get up for selection, you have to get cleared by NAMI. However, I know my friend in Navy ROTC didnt go to Pensacola though while he was in college.
NAMI is fun and awkward. Couldnt tell if some of the cuties in my group were hitting on me or not because you all do get your own hotel room and lots of free time.... I dont think thats against the rules either since we arent commissioned or even candidates at that point. I worked out in the gym there to kill time, the guys at the front desk dont seem to care much as long as you dont go during the rush hour and that place is packed full of DYEL 19 yr olds like I have never seen on any college campus.
Hopefully you wont go in the winter if you do go. I was supposed to fly back the day the whole south got hit by a blizzard closing every airport and way out of the south. Was stuck in the hotel in Pensacola for two extra days until they could fly to me Texas, to go back to Philly.