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Unlike nonimmigrant visas, which are attached to the applicants' passport, the immigrant visa is the Form DS-230, together with an endorsement by the consular officer and the supporting documents. These documents are placed in a sealed envelope for travel to the United States. An immigrant visa is valid for travel to the United States for a period of up to six months. In some situations, the visa may be issued for a shorter period. For example, the validity may not extend beyond a date 60 days prior to the expiration of the applicant's passport, or, when issued to an accompanying child, may not extend beyond the date on which the child becomes 21.
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