I would like to apologize to all of you for some misunderstandings that seem to have occurred somehow. Todd refers to me as an experienced educator or something to that effect, which I most definitely am not. I a "techy," "instructor," whatever word you wish to use, not the actual band director. I am about to start my first year of college, sorry for any misconceptions.
That being said, the director is the one in charge, but he, a trumpet player, may or may not know certain things about the situation. For instance, he was completely unaware that marching sousa caused even mild back pains until I told him. I am trying to be well informed for this situation, i.e. I want to be sure if the kid is pulling a fast one that I can inform the director and make sure he doesn't get away with it. On the other hand, if the kids concerns are legitimate and the sousa could seriously damage his back, I want to make sure the director doesn't make him march anyways. In the end it's between the kid, his parents and the director, but the kid and the band both have potential, and I don't want to see either wasted (small tuba section losing one strong player, we all know how that goes).
I have no intention of forcing anybody to march a sousa if they don't want to, having him switch to baritone was my first thought (before I even thought to question what the kid said about the doctors diagnosis actually

). The director, who is much older and more experienced than I am, was immediately suspicious and doesn't believe the kid at all, which is what got be searching for answers. And after reading some of these posts (particular Lelands and the inspiring insight of dear old mom, and I think Scoobs post pointing out the correlation between doctors saying what parents want to hear and their pocket money) I think a little more investigating is necessary before a definitive decision is reached.
In the mean time, I have another plan you all should find amusing. The school happens to be borrowing an old, slightly battered 3/4 (if that) convertible horn, smaller even than that puny Yamaha CC, 621 is that right? Anyways, in the mean time, I may propose having him march that. If he really can't march a sousa, problem more or less solved. If he can, the humiliation of carrying the "baby" horn should be a good motivator for a change of heart. What do you all think?
Thanks again, you guys have all been a huge help. Thank you Todd in particular for your staunch defense (possibly unwarranted, sorry if I let you down), and for whoever it was who scared me with the word "lawsuit." See you tomorrow.