I was in the marines and almost discharged because I could not run very far without severe leg cramps. Due to the fact that I scored so high on the other events, I was not required to run and made an aircraft mechanic and crew chief. This problem persisted throughout my life. Recently, a stint was put in my right leg and a warning that I might have to have one in my left leg due to poor circulation. My question is: Could this be cause of my problem running in the marines