Hey man, you still have lots of time to become an officer!
If your life involves a lot of activities which may stress the knee, I don't understand why the doctor repaired it. If possible, he should have trimmed the torn portion and you will continue with your life. (some on here will say otherwise, but i think they are in the minority.)
I got a partial trim and recovered in a few weeks. They are not 100% yet, but running etc dont give me any problems anymore. I am fairly certain you will be fine if you are in good shape and are young.