A Tactical Marine is a Firstborn Space Marine who is equipped to fight using a variety of ranged weapons across a broad range of combat conditions and is part of a ten-Astartes unit called a Tactical Squad. Tactical Squads were once the most common type of Space Marine squad in a given company and formed the mainstay of a Firstborn Space Marine Chapter. It was he most numerous and strategically versatile warriors in a Codex Astartes-compliant Chapter form battleline squads. They are flexible enough to press home an attack, or hold a position with withering firepower. Whatever the strategic challenge, battleline squads are usually equal to the task.