A '''Tactical Squad''' is a type of '''[[Firstborn]]'''{{Fn|4}} warrior [[Battleline Squad]]{{Fn|8}} formation in a [[Space Marine]] army. A Tactical Squad is the most versatile and tactically flexible force in the [[Space Marine]] army{{Fn|1a}}, making up the majority of the four [[Battle Company|Battle Companies]] and the entirety of two of the four [[Reserve Company|Reserve Companies]] in a typical [[Codex Chapter]].{{Fn|1b}} This makes them the most common type of unit in the Space Marine forces.{{Fn|1a}}