They require leaders to make decisions rapidly and to issue brief oral orders quickly. They require minimal commands from the chain of command to accomplish and are standard throughout the Army.
Sequential actions are vital to success in combat or critical to preserving life.
They represent mental steps followed for offensive and defensive actions in training and combat. A unit's ability to accomplish its mission often depends on soldiers, leaders, and units executing key actions quickly. All soldiers and their leaders must know their immediate reaction to enemy contact as well as follow-up actions. This results from continual practice. Drills provide small units with standard procedures essential for building strengths and aggressiveness.