i graduated from ocs back in October "02 class 02-03 ohh rahh. if your running that much you will be fine. pt is five times a week, and the runs are never more than a few miles. there is one maybe two five milers but those are battalion size so they are pretty slow. focus on endurance type training. that is what you will need for those daily trips to the sand and any "extra military instruction" you may recieve.