It will have a paper with the approval for you to travel (if you are flying). There is also a directory of places to live, a map of the MMAC. The letter tells you your Basic Class # and Enroute Class #, reporting time and date. Remember...get to the security early and sit closest to the door unless you like standing in an anxious line for 40 minutes!! Another page tells dress codes - nice clothes, no t-shirts, jeans or tennis/athletic shoes. I think that is pretty much everything that is in your packet (it will come Fed-ex...at least it has for everyone that I know of).