I see. How about considering this.
To be an occupational therapist, you correctly stated that it requires a Masters or PhD. In order to get there, you must have an undergraduate degree. So, in theory, the next 2 years really isn't a waste. School is school. However, the military will pay for continued education. Even if that meant getting your masters or PhD while on active duty. (Which is when the vast majority of military officers get their masters and PhD. Most don't get to go directly out of the academy). Then, after getting the Masters or PhD, they can "cross train" into occupational therapy. By which time, they would have probably made some contacts through the other medical fields at whatever base they are stationed at. However, if your cadet wants to pay for their remaining 2 years of undergraduate, as well as their graduate studies by leaving the academy, then that is definitely their choice.
Now; that was my "objective" rational for staying at the academy. My "persona" and "non-objective" opinion is actually quite different. I believe that serving in military service is not only an honor, but a calling. It may not be a calling that you are born with, but it's definitely something that you should feel compelled to do. There are definitely some people that apply to the academy strictly for the education. Their opinion is that serving in the military is simply their way of "paying back" the government for the education. There's also some that come to the academy with the sole purpose of being a pilot. And when they find out they aren't pilot qualified, they want to leave. I've also seen some who were recruited athletes come to the academy, and when they didn't turn out to be the college star that they thought they should be, they left the academy. I can't really keep my opinion to myself on these decisions.
Personally, the academy can NOT be a person's goal. It is simply a means, of many, of reaching your goal(s). If "Serving your country" isn't high on the priority list of why you're at the academy, which means having 2,3, or 4 jobs lined up because the NEEDS of the air force must come first; then maybe the military and an air force career isn't for this person; and maybe they should leave.
But to end on the positive note that I tried to explain in the first paragraph, the vast majority of military officers work on their masters and PhD while on active duty. If your cadet does want to serve in the air force, then s/he might need to serve a couple of years in a different job while they're finishing up their masters degree, but they can still work towards becoming an occupational therapist. But if s/he really thinks that they are "putting up" with day to day crap; then they really don't know what they've gotten into. Military life isn't crap. If they don't see the reasons that they are going through this "Crap", I'm not sure they'll ever get it. S/he is in their 2nd year. It's the hardest year academically, but it's so much easier with the "Crap" than last year was. Hopefully s/he will figure out what is best for them. Hope it all works out. Mike....