I'll chime in with agreement that yes, sports and ROTC are very compatible, although it does require a bit of understanding and coordination between coach and PMS.
Goaliegirl is playing DIII hockey, which pretty much starts when she stepped on campus and will end in late February or potentially early March. With hockey practices overlapping ROTC PT (hockey practice actually starts earlier), she is excused from PT until season is completed, but she actually gets more PT (although not necessarily the best preparation for the APFT) through her 3 days of ice time and 2 lifts a week for the team.
She also misses 1 practice per week (team practices 4, plays 2) due to Leadership Lab time conflict. Coach has been very accommodating in that regard.
Fortunately, FTX occurs before hockey games start, but if there is an overlap for a sport this should be arranged well in advance.
One piece of advice when talking to coaches during the recruiting cycle - Know the ROTC requirements (PT, FTX, potential class conflicts) and tell the coach up front what they are. More importantly, stress that while you have 4 more years of competition, college and college athletics are there to prepare you for your life goals, which are to serve your country. We have yet to find a coach who doesn't respect that - even the Canadians who tend to dominate hockey coaching.
@Clarkson - Best of luck in recruiting a D1 hockey player. In this biased parent's opinion, they are the best athletes out there. Speed, strength, cardio, hand-eye coordination, and lacking fear for physical punishment. The complete set of requirements to be successfull in the military.