This United States Marine Corps USMC manual, Marine Corps Reference Publication MCRP 3-10A.3 Marine Infantry Platoon February 2021, provides planning and operating considerations inherent to current operational environments and tactics, techniques, and procedures for infantry platoons. This publication is a foundational document to assist in the preparation and execution of platoon-level operations. MCRP 3-10A.3 is designed to form the educational foundation required to empower small unit leaders with the knowledge needed to apply creative and adaptive thought to tactical decision making, in order to make timely and sound tactical decisions. Its primary audience is infantry platoon commanders, platoon sergeants, and section and squad leaders. The secondary audience consists of leaders assigned as platoon commanders, platoon sergeants, and section and squad leaders from units across the Marine air-ground task force when serving as provisional infantry.