Obviously, you are already beyond the average kid entering boot camp (physically) Don't stress yourself out over it. Boot camp is a challenge, but it doesn't matter if you go in there as Arnold Schwarzenegger or Tom Arnold, you are going to be challenged either way. As someone already mentioned, the better shape your in, the harder they will be on you. If you are out running 6 miles a day now, you will have no problems with the PHYSICAL part. The mental part is the hardest anyway, and there truly is no way to prepare for that. You will never be able to do anything right, fast enough, or clean enough. You will feel like you are on the shit list every day. That's part of boot camp. Just go to high school, enjoy yourself, have fun, learn all you can, take advantage of everything you can, and then, when you turn 17, if you still want to be a Marine, call the recruiter, and have him come to the house and talk to your parents. One piece of advise to you though, and take it for what it's worth. Explore all of the fields available, and consider something that is going to provide you a little more usable skill when you get out. The grunt life sounds exciting when you're 15 years old and bored out of your mind, but when you're 19 and 10,000 miles from home with a bunch of assholes trying to give you a third eye, and you're wondering if this is going to be the last breath you'll ever take, those other LESS EXCITING jobs look a lot more inviting. There's nothing glorious about getting killed, and nothing glorious about killing someone else. Anyone who tells you otherwise, hasn't ever had to do it. Good luck and Semper Fi!
The reason it has never been done before is because the Marine Corps is a High Mobility Expeditionary Force, not an occupational force. I was in Delta company (7th ESB). We specialize in Amphibeous Assault Fuel Systems, not pipelines. The Army's Petroleum Supply Specialists(77F) train specifically for pipeline operations. It's what they do. This is the first time Marines have ever been asked to do a pipeline operation in a combat theater. The reason the Marines were ordered to do it is because the Army needed 20-25 days to put in a 60 mile pipeline. We had it laid in in and fuel flowing into LSA Viper in 36 hours. Their flow rate maybe a little faster, but by the time they got their pipeline laid, we had already pumped 22 million gallons(and the war was over). Uncle Sam did what he always does when he needs something done right.....He called the MARINES!!!!