An applicant for medical relief who is on active duty shall furnish a certificate identifying him. Such certificate shall be signed by an officer or other appropriate supervisory official of the Coast Guard. In an emergency, the officer in charge of a medical relief station, or a designated physician or designated dentist, may accept other evidence of status satisfactory to him.

(Sec. 610(b), 58 Stat. 714 as amended; 33 U.S.C. 763c)