This United States Army manual, Army Techniques Publication ATP 3-90.1 Armor and Mechanized Infantry Company Team October 2023, provides techniques for the employment of Armor and mechanized Infantry company teams within combined arms battalions (CABs) in the Armored brigade combat team (ABCT). It provides the framework and technical employment principles for Armor and mechanized Infantry company teams within CAB in the ABCT. The techniques contained in this Army techniques publication are to be used as a guide and are not to be considered prescriptive. This Army techniques publication includes discussions of doctrine that are applicable to all Armor and mechanized Infantry companies. This publication serves as an authoritative reference for United States Army Training and Doctrine Command personnel who develop doctrine material and force structure, institutional and unit training, and company team standard operating procedures (SOPs). It is a guide for Armor and mechanized Infantry companies to develop SOPs. This publication provides doctrinal guidance for commanders, staff, and leaders who plan, prepare, execute, and assess the operations of Armor and mechanized Infantry company teams. Specifically, it is directed toward the company commander, executive officer, first sergeant, platoon leader, platoon sergeant, fire support officer, master gunner, supply sergeant, signal support specialist, emergency care sergeant, field maintenance team chief, and all supporting units.