Yes, you will have to wait until he gets there. A squad name/# won't be assigned until he gets there (I'm guessing on that one because in the Air Force, we had a Flight # assigned as well as the barricks(sp) name so they could get it to the right place).
And, please do write weekly. Mail call was one of the greatest times. It took your mind off your day and gave you a feeling of home. News is great also.
No care packages allowed unless it's something that can be bought (and is needed) at the PX/BX like razors for shaving (no blades, they have to be the disposable due to suicide risks, there are some people that can't handle it), shaving cream, toothpaste, things like that. No food, ciggs, alcohol, etc.. The food is provided by Uncle Sam and not allowed from outside sources due to some folks are on the "fat boy" program and some are on the "thin boy" program (where they get you up to weight, that was me). All the food is monitored because it has the right amount of calories, etc.. for what they do. When they get base privileges(sp) then they can buy junk food or whatever they want.
edited: How rude of me, I forgot to say Good Luck and Thank You to your friend.
Wayne