here's some suggestions for you.
1. see the physical therapist, and sit down with them and explain your symptoms and concerns, before they have you do any exertion with it, and see if they have any doubts as to the opinion the doctor you saw has. I've seen therapists who, when they see the patient, will write up a report that it is their opinion that there is more wrong and that they recommend a re-evaluation, that they feel PT not indicated at present. See what they think.
2. Take your MRI and pay for a private OS consultation from an orthopedic surgeon outside the military system. It costs a couple hundred to pay out of pocket to a physician 'no insurance' but if you are convinced you have a problem and want the second opinion... it's up to you.
3. a diagnostic method my OS has used is to try a cortisone shot, if it relives the symptoms temporarily and they come back, then its another clue in the puzzle that there may in fact be something torn. Not advocating to do so.. but saying that they may suggest this.
4. Did the OS look at the flims himself, or just rely on the report? MRI reports are only as good as the radiologist who read the films... a good OS will read the films himself and make his own conclusions. Mine has found stuff on the MRI films that the radiologist never saw... got the scope pics to prove it.