Sec. 37.
That when used in this Act, unless the context otherwise requires, the terms "person," "vessel," "documented under the laws of the United States," and "citizen of the United States" shall have the meaning assigned to them by sections 1 and 2 of the "Shipping Act, 1916," as amended by this Act; the term "board" means the United States Shipping Board; and the term "alien" means any person not a citizen of the United States.