A visas are issued to diplomats and other government officials for travel to the United States. With the exception of a Head of State or Government who qualifies for an A visa regardless of the purpose of his or her visit to the United States, the type of visa required by a diplomat or other government official depends upon their purpose of travel to the United States.
A visa allows a foreign citizen to travel to the United States port-of-entry, and request permission of the U.S. immigration inspector to enter the U.S. A visa does not guarantee entry into the U.S.
The consular officer will determine whether you qualify for the visa. For an A-1 or A-2 visa, you must be traveling to the United States on behalf of your national government to engage solely in official activities for that government. Government officials traveling to the United States to perform non-governmental functions of a commercial nature, or traveling as tourists, require the appropriate visa, and do not qualify for A visas
Foreign officials who are traveling to the United States on official business must obtain an A visa prior to their entry. They cannot travel on tourist's visas, or visa free under the Visa Waiver Program. Please note that U.S. visa law indicates that if a visa applicant is entitled to an A visa as a principal or dependent, he or she must receive an A visa.
Immediate family members are defined as the spouse and unmarried sons and daughters of any age who are members of the household, even if studying in a different location. Those who may qualify for immediate family status on this basis include: any other relative, by blood, marriage, or adoption, of the principal alien or spouse; a domestic partner; and a relative by blood, marriage, or adoption of the domestic partner. The term "domestic partner" for the purpose of this section means a same-sex domestic partner
Personal employees, attendants, domestic workers, or servants of individuals who hold a valid A-1 or A-2 visa may be issued an A-3 visa. As part of the application process, an interview at the embassy or consulate is required. Proof that the applicant will receive a fair wage, sufficient to financially support himself, comparable to that being offered in the area of employment in the U.S. is also required.