If you do not have a valid passport, you should apply for one immediately, as acquiring a new passport can take up to six weeks or more. For more detailed information on applying for or renewing a passport, including a full listing of all passport acceptance facilities, you may wish to visit the website http://travel.state.gov/passport.
Once you receive your passport, please make sure that you sign it.
If you already have a passport, make sure that it will be valid until at least six months after you plan to return to the US. If your passport will not be valid for this amount of time or if your passport is expired, you will need to renew your passport immediately. Once you receive your new passport, please make sure that you sign it.