22 C.F.R. § 41.41 Crewmen.
(a) Alien classifiable as crewman. An alien is classifiable as a nonimmigrant crewman upon establishing to the satisfaction of the consular officer the qualifications prescribed by INA 101(a)(15)(D), provided that the alien has permission to enter some foreign country after a temporary landing in the United States, unless the alien is barred from such classification under the provisions of INA 214(f).
(b) Alien not classifiable as crewman. An alien employed on board a vessel or aircraft in a capacity not required for normal operation and service, or an alien employed or listed as a regular member of the crew in excess of the number normally required, shall not be classified as a crewman.