I imagine that, with the ROTC, they did completely different movements and exercises; movements they're not used to performing. And it's the first practice, so their bodies aren't warmed up at all. This kind of stuff is exactly what leads to injury.
Practice 3 would've been just fine. Not seeing the point of it on day 1.
I understand the concern, but aren't we assuming that the team was subjected to a level of ROTC training that oversteps the bounds of a first practice? In other words, I'm sure the ROTC also has training exercises of varying degrees of difficulty and we can't say for sure that the players experienced a session that was beyond their fitness level.
I'm sure the ROTC enrolls individuals who are able to pass necessary fitness exams but have nothing close to the fitness level or natural athleticism of these D1 basketball players. Those ROTC enrollees also have first days of training, experiencing movements they are not used to and at a time when their bodies are not warmed up. I'd be surprised if the ROTC subjects those enrollees to a first workout that is highly likely to injure and break. As such, I would expect the ROTC to put the team through a tough workout but a workout that is meant for enrollees at an earlier stage of training. Don't forget, the guys have been on campus and working out for weeks now (cumulating in a 5K only 3 days ago).
Not trying to squash your point. I also worry about pushing athletes too hard too early. But I don't think today's ROTC workout automatically implies that the team was pushed too hard. It's possible they experienced exactly the right difficulty for the position they're in