5. In some cases, additional reviews will be required.
Your information is submitted and checked in the world's foremost security database, which includes comprehensive information drawn from both U.S. and foreign law enforcement agencies worldwide. If your name or a close variation indicates security concerns, the process will be delayed. Additional steps will vary from requests for additional interviews and information to official registration and fingerprinting. This may add at least 4 to 6 weeks to the processing time. Registration upon arrival in the United States is mandatory in many cases but registration can be required in any case regardless of country of origin.

6. A visa allows you to travel from your country to a port of entry in the U.S.
In many cases, that port of entry will be the airport where you land. On the airplane you will be asked to complete a short arrival/departure form. When you deplane, follow directions for non-citizen entry. At the airport, a U.S. official will interview you and verify all of your paperwork. Once admitted ,you will receive an immigration stamp and proceed to baggage claim and U.S. Customs.

You may be informed by the consular office before leaving your country if you will be subject to special clearance procedures. Some travelers may be directed to private workstations in the arrivals hall, where special registration, photos and electronic (ink-less) fingerprints will be taken. Additional interviews and verification processes will also be conducted.