Marine Corps Tactical Publication (MCTP) 3-01D, Tactical Employment of Mortars, is a multiservice publication that provides a doctrinal reference for employing mortar squads, sections, and platoons. It contains guidance on tactics and techniques that mortar elements use to execute their part of combat operations described in battalion- and company-level manuals. This publication contains guidance on how a mortar element’s fires and displacement are best planned and employed to sustain a commander’s intent for fire support. The target audience for MCTP 3-01D includes mortar squad, section, and platoon leaders, company and battalion commanders, battalion staff officers, and all others responsible for controlling and coordinating fire support.