Entry into the U. S. is authorised by a DHS, Customs and Border Protection (CBP) officer. When you come from abroad and first arrive in the U. S. , the visa allows you to travel to the port-of entry and request permission to enter the U. S. Admission or entering the U. S. , by non-U. S. citizens must be authorised by a CBP officer at the port-of-entry, who determines whether you can enter and how long you can stay here, on any particular visit. If you are allowed to enter, how long you can stay and the immigration classification you are given is shown as a recorded date or Duration of Status (D/S) on Form I-94, Arrival Departure Record, or Form I-94W, if arriving on the Visa Waiver Program. For more information, go to the DHS, CBP website. If you want to stay longer than the date authorized, you must request permission from the DHS, U. S. Citizenship and Immigration Services (USCIS).