A tankerman is a Coast Guard mariner credential. A tankerman carries out and oversees the transfer and storage of liquid cargo such as fuel or oil. Credentials are for a tankerman assistant, tankerman engineer, and tankerman person in charge (tankerman-PIC), whose duties involve overseeing the transfer process and storage. To obtain a tankerman-PIC endorsement, you need 90 days of service on tanker or 60 days on a barge or ship. You also need to complete Coast Guard firefighting and cargo courses and learn the skills for liquid cargo transfers under the supervision of another tankerman-PIC.