The commissioned volunteer Reserve Deputy Sheriffs shall have the right to use the Pierce County Sheriff's equipment and vehicles as deemed necessary by the Department. The volunteer Reserve Deputy's commission shall be valid only when on official duty as part of an assigned shift or detail. The volunteer Reserve Deputy Sheriffs shall serve without pay for the period as determined by the Sheriff and shall not be deemed to be agents or employees of Pierce County, but are volunteers who are authorized to use Pierce County vehicles, equipment, and uniforms as is deemed necessary by the Sheriff.