What is defined as a collective action executed rapidly without decision-making?

The term that best fits the description of a collective action executed rapidly without decision-making is indeed "Battle drill." Battle drills are standardized procedures that units perform in response to specific situations or threats. These drills are designed to enhance the unit’s ability to execute immediate actions quickly and effectively, based on established protocols, rather than requiring deliberation or decision-making in the heat of the moment.

By training extensively on battle drills, soldiers develop muscle memory and situational awareness that allow them to act instinctively when faced with real-world scenarios. This rapid execution is critical on the battlefield, where decisions must be made with urgency, and delays can lead to adverse outcomes.

In contrast, while field training exercises, logistical coordination exercises, and live training can involve collective actions, they typically involve a degree of planning, coordination, or decision-making that does not fit the description of acting rapidly without such elements.