Marine Corps Interim Publication MCIP 3-10A.3i Marine Infantry Platoon June 2019 Marine Corps Interim Publication (MCIP) 3-10A.3i, Marine Infantry Platoon, provides planning and operating considerations inherent to the current operational environments for deployed infantry platoons, along with an adjustment in the mission statement of the Marine infantry company. This publication contains doctrine and tactics, techniques, and procedures utilized by the infantry platoon.This publication’s primary audience is the infantry platoon commander, platoon sergeant, 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 in a provisional infantry platoon role.This publication is a foundational document to assist in the preparation and execution of platoon level operations. The publication, when taken in context with other Marine Corps doctrine, 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.