What countries are NOT allowed to participate in the program?

Afghanistan, Albania, Algeria, Angola, Bahamas, Barbados, Belarus, Bosnia and Herzegovina, Botswana, Bulgaria, Burma, Burundi, Cambodia, Central African Republic, Congo Free State, Cote D’Ivoire (Ivory Coast), Crimea, Croatia, Cuba, Democratic Republic of Congo, Ecuador, Ethiopia, Ghana, Guyana, Iceland, Indonesia, Iran, Iraq, Jamaica, Kosovo, Laos, Lebanon, Liberia, Libya, Mauritius, Mongolia, Montenegro, Nicaragua, North Korea, North Macedonia, Panama, Pakistan, Papua New Guinea, Romania, Russia, Serbia, Slovenia, Somalia, South Sudan, Sri Lanka, Sudan, Syria, Trinidad and Tobago, Tunisia, Uganda, Ukraine, Venezuela, Yemen, and Zimbabwe.