National Visa Center:

A Department of State facility located in Portsmouth, New Hampshire.  The NVC supports worldwide operations of the Bureau of Consular Affairs Visa Office.  The NVC processes immigrant visa petitions from the DHS for people who will apply for their immigrant visas at embassies and consulates abroad.  The NVC reviews documents, such as the DS-230 and I-864, for technical correctness completeness.  It also collects fees associated with immigrant visa processing.