This United States Marine Corps USMC manual, Marine Corps Tactical Publication MCTP 3-40B Tactical Logistics April 2025, provides the doctrinal basis for the planning and execution of tactical ground and aviation logistics support provided by the Marine Corps installations and logistics enterprise. Marine Corps Tactical Publication 3-40B expands upon Marine Corps Warfighting Publication 3-40, Marine Corps Logistics, and provides detailed guidance to Marine Corps logisticians for the conduct of logistics at the tactical level, and it establishes standard terms of reference for tactical logistics and combat service support operations. This publication is primarily intended for commanders and their staffs who are responsible for planning and conducting logistics operations at the tactical level of warfare. The secondary audience is commanders and staff officers who require logistics support or who will benefit from a greater understanding of this support at the tactical level.