This Army and Marine Corps multiservice publication serves as doctrinal reference for the employment of mortar squads, sections, and platoons. It contains guidance on tactics and techniques that mortar units use to execute their part of combat operations described in battalion-, squadron-, troop-, and company-level manuals. This publication also contains guidance on how a mortar unit's fires and displacement are best planned and employed to sustain a commander's intent for fire support. The target audience of this publication includes mortar squad, section, and platoon leaders, company and battalion commanders, battalion staff officers, and all others responsible for controlling and coordinating fire support during combined arms operations. Training developers also use this manual as a source document for combat critical tasks. Combat developers use this manual when refining and revising operational concepts for Infantry and reconnaissance mortar organizations. This publication serves as the primary reference for both resident and nonresident mortar tactical employment instruction.