My DS did not live with a ROTC cadet as a freshmen and in a way he regretted it. Mainly due to the fact that as others have stated his room mate was not an early bird, but instead a night owl. DS too is a night owl, but he quickly realized that going to bed at midnight and having to be up and at PT 6 a.m. the next morning with classes all day was not going to work for him. So for a year he had to deal with placing a pillow over his head because the roommate had the lights on until 1 a.m.
~ His following years he roomed with AFROTC cadets.
I would also say that as he progressed through AFROTC his friendships changed. He became more involved in ROTC, including joining a military fraternity and due to that more of his friends were in ROTC. He had and still has friends that were not in ROTC, but the majority of them are in the AF now. It is also due to commonalities. Your ROTC friends understand that you can't just sleep in and not go to PT. Your ROTC friends understand why you are spending an hr shining your shoes and belt buckles instead of playing a game on your PS4. They understand when you speak in acronyms...i.e. OML, PFT, LLAB, etc.
~ I recall one conversation in his junior year regarding how he was seeing friendships change. His non-ROTC friends were just living day to day that year with no thought about life after graduation, whereas, for him he already knew that he was going to go to UPT upon graduation. As seniors it became even more apparent in the fall because they were now trying to decide between grad school (more debt) or applying for jobs. DS otoh was able to enjoy his senior year knowing everything was already set for him, as long as he kept his grades up and his nose clean.