Since the D visa does not allow you to stay in the U.S, there are several restrictions which you will have to follow with the D visa, you cannot:
Stay in the U.S for more than the designated time. Study in the U.S. Find employment in the U.S. Extend the D visa. Adjust or change the status of the D visa. Apply for a Green Card with a D visa. Work for another company except the vessel or airline you were in Enter and leave the U.S from different dock or airport Do longshore work on a D visa Re-enter the U.S within 6 months