flying or driving?? If your flying, the U.S. gov't is requiring a passport to enter the u.s. as of jan 22/07. This applies to u.s. and foreign citizens. You will need a passport to re-enter the u.s. if flying. If driving, no passport is required. As I've said before on this site, the biggest problems americans face at the border is a past criminal history, as a charge that your country doesn't consider a felony, is considered one here. Also, don't forget to get your export permits in order before you leave the u.s. might also want to e-mail fish and game and find out if the ban on importing wild game is still in effect.