This United States Marine Corps manual, Marine Corps Reference Publication MCRP 3-40B.5 Petroleum Operations January 2021, provides doctrinal guidance for bulk petroleum operations for the Marine air-ground task force. It specifically addresses the techniques and procedures for the handling of bulk fuel in a joint/multinational environment. Additionally, this publication provides information on the bulk liquids mission, organization, and concept. It is intended for Marines involved in the planning or conducting of bulk fuel operations, from commanders to personnel in bulk fuel units. This publication supersedes Marine Corps Reference Publication MCRP 3-40B.5, Petroleum and Water Logistic Operations, dated 19 June 2005.