This circular provides leaders with information about and training guidance for using training aids, devices, simulators, and simulations (TADSS) in support of the Infantry rifle and weapons company. It also describes how leaders may use TADSS to support specific training events. It follows the doctrine in FM 7-0 and FM 7-1 and complements the IBCT combined arms training strategy (CATS). Finally, it provides TADSS training programs for use by the Infantry company leader (DA Pamphlet 350-9 provides additional TADSS information): Chapter 1 explains how TADSS work within the Army's training infrastructure by showing how Infantry company leaders can use the IBCT CATS to support their unit training strategy. Chapter 2 contains examples of how TADSS are used. Chapter 3 describes the TADSS, and their capabilities, limitations, recommended training strategies, and supporting references. Each appendix provides a matrix that links tasks to TADSS and that support the Infantry CATS, from mortar section to company. This publication applies to the Active Army, the Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR) unless otherwise stated. The proponent of this publication is the United States Army Training and Doctrine Command (TRADOC). The preparing agency is the US Army Infantry School. Today's broad range of missions and the unpredictable nature of the contemporary operational environment (COE) cause personnel turbulence, high operating tempo (OPTEMPO), and new equipment and systems. Time is an inflexible resource-there is never enough, and it cannot be increased. Leaders improvise with the resources at hand, exploit opportunities, and accomplish the mission within the commander's intent. They achieve combat readiness by effectively using TADSS for realistic and challenging training. Identifying and integrating TADSS supports the crawl-walk-run training approach.