This United States Army Manual, Training Circular TC 3-20.31-105 Gunnery: Medium Tank April 2025, provides the gunnery training plan for all prerequisite and live-fire training for the M10, Booker medium tank. It includes all training events through crew qualification following the Integrated Weapons Training Strategy (IWTS) structure. It provides the necessary information to plan, prepare, execute, and assess each training event within the medium tank training strategy. The principal audience for TC 3-20.31-105 is commanders, trainers, and Master Gunners of movement and maneuver units. Trainers and educators throughout the Army will also use this publication. Commanders, staffs, and subordinates ensure that their decisions and actions comply with applicable United States, international, and, in some cases host-nation laws and regulations. Commanders at all levels ensure their Soldiers operate according to the law of war and the rules of engagement. (See FM 6-27 for legal compliance.) The use of a trade or brand name does not constitute endorsement of any specific commercial product, commodity, service, or enterprise by the United States Army. TC 3-20.31-105 applies to the Active Army, Army National Guard/Army National Guard of the United States, and United States Army Reserve unless otherwise stated.