Can an ROTC Cadet (SMP) attend the Master Fitness Trainer Course?

I recommend that you ask up your chain of command and make sure that role is still what the unit wants from you with your change in status. I did the same thing as an SMP and went to training as a cadet. In some cases I put my E-5 back on to attend the school. The rules have changed in the last 30 years, so check with your training NCO and your Command

Hate to sound like a Negative Nancy but I think MAJ (Join to see) is probably right on the good investment part. That's a lot of money to spend on someone that won't be utilizing that training. I can say that I wouldn't send you but hey, I'm just some dude in Indiana. LTC John Shaw is right, go ask your chain.

Yes, you should be able to attend the Master Fitness school, but it is up to your command. You will be commissioned in a couple of years though and the unit will lose you, so do not be surprised if your commander does not let you attend the school. Also, since you will become a ROTC cadet, you will be excused from battle assemblies for ROTC activities. To be honest, I would not send you to Master Fitness School under these circumstances, unless you planned on remaining in my unit as a 2LT. Focus on ROTC for now.