Section 126
SEC. 126. Before issuing the certificate the officer of the customs; shall require the master and the watch officers of the vessel to take the oath of allegiance to the United States. Evidence that the master or any of the watch officers is a citizen of the United States will be accepted in lieu of such oath on the part of said master or watch officer. Officers of the customs shall, wherever practicable, afford opportunities For the crew of a vessel to which a certificate has been issued, to take the oath of allegiance to the United States.