Army Tactics and Procedures (ATP) 3-20.16 covers the mobile gun system platoon's organization and functions; its internal roles and responsibilities as well as its roles within the Stryker brigade combat team Infantry rife company; the platoon's capabilities and limitations; and the doctrinal guidance, tactics, and procedures the platoon uses in unified land operations. ATP 3-20.16 provides doctrinal guidance for commanders, staff, and leaders, who plan, prepare, execute, and assess operations of mobile gun system platoons. It is also intended for mobile gun system platoon leaders, platoon sergeants, team leaders, Stryker brigade combat team company level leaders, and supporting units. It serves as an authoritative reference for personnel who develop doctrine (fundamental principles and tactics, techniques, and procedures), material and force structure, institutional and unit training, and mobile gun system platoon standard operating procedures. The doctrinal principles and procedures contained in ATP 3-20.16 are to be used as a guide and are not considered prescriptive. ATP 3-20.16 outlines the framework in which mobile gun system platoons operate, either alone or together as part of the combined arms company team. ATP 3-20.16 also includes discussions of doctrine applicable to all mobile gun system platoons. This publication applies to the Active Army, Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR) unless otherwise stated. The proponent for this publication is the United States Army Training and Doctrine Command. The preparing agency is the U.S. Army Maneuver Center of Excellence.