We didn't need copies last year but I did make a copy of his passport, birth certificate and TWIC card as well as his credit card and stuck it in the safe-just in case. If you are not sure, take it with you.
He needs to bring the originals of the documents specified. My recollection from 2008 was they made the copies, etc. they needs at the Academy. As noted previously, I strongly agre with the recommendation that you keep a copy of every original document, prefereably noterized with you back home. My son has had no issues but it's always better safe then sorry.