Travelers using the Guam–CNMI Visa Waiver Program or the parole are required to complete an I-736 form (online as of February 2018), hold a machine-readable passport and nonrefundable return ticket, and are not permitted to travel to other parts of the United States. Because of special visa categories for the Northern Mariana Islands' foreign workers, traveling between Guam and the Northern Mariana Islands still requires a full immigration inspection, and all visitors departing Guam or Northern Mariana Islands are inspected regardless of final destination.