Section 13.405 - Proof of service for tankerman-assistant endorsementService must be proved by either-
(a) A letter on company letterhead from the owner, operator, or master of a tankship or self-propelled tank vessel. The letter must specify-(1) The name of the vessel(s), the applicable dates, and the port(s) or terminal(s);(2) The classification of cargo (DL or LG) carried while the applicant accumulated the service;(3) The number of days of deck service the applicant accumulated on the tankship or self-propelled tank vessel; and(4) That the applicant has demonstrated an understanding of cargo transfer and a sense of responsibility that, in the opinion of the signer, will allow the applicant to safely carry out duties respecting cargo transfer and transfer equipment assigned by the PIC of the transfer without direct supervision by the PIC; or(b) Certificates of Discharge from tankships with the appropriate classification of cargo (DL, LG, or both); and a letter on company letterhead from the owner, operator, or master of one of the tankships or self-propelled tank vessels stating that he or she has demonstrated- (1) An understanding of cargo transfers; and(2) A sense of responsibility that, in the opinion of the signer, will allow him or her to safely carry out duties respecting cargo and its equipment assigned by the PIC of the transfer without direct supervision by the PIC.USCG-2004-17914, 78 FR 77996, Dec. 24, 2013