Citizens of Belgium who wish to travel to the United States under the Visa Waiver Program must present a machine-readable passport issued by the Belgian Government. Some Belgians citizens are in possession of valid passports that were issued prior to the introduction of the machine-readable passport. Belgian citizens may continue to use valid non-machine-readable passports but will be required to apply for a Non-Immigrant Visa at a US Embassy to travel for business or tourist reasons to the United States.