The Persian Gulf Fleet is a naval force that is part of the United States Navy's Fifth Fleet. It is responsible for providing security and stability in the Persian Gulf region, as well as conducting maritime security operations and supporting other coalition forces in the region. The term 'Oilers' refers to the personnel who are responsible for refueling and re-supplying ships in the Persian Gulf Fleet. They are an integral part of the fleet, ensuring that ships have the necessary fuel and supplies to complete their missions.