DHA-73 Passport Application Form. Please note that both parents should sign the DHA 73.• Copy of Passport. • Copy of South African Unabridged Birth Certificate. Bring Certified U.S. Birth Certificate, completed forms, parent(s) and passport photos. Do not sign forms until asked to do so. PASSPORT VALIDITY: Must be valid at the time of entry and exit. Dependent children and dependent relatives in the ascending line who form part of the family unit. Required documents​​. 1. Select the US Embassy or Consulate where you will apply for an immigrant visa to learn what additional requirements there are, if any.