(a) The OCMI enters on the COI issued to each manned tank vessel subject to the regulations in this chapter the number of crewmembers required to hold valid MMDs or MMCs with the proper tankerman endorsement. Table 1 to §15.860(a) of this section provides the minimum requirements for tankermen aboard manned tank vessels;Table 2 to §15.860(a) of this section provides the tankerman endorsements required for personnel aboard tankships.