Which of the following is NOT one of the defensive fundamentals?

The correct answer highlights that "quick retreat" is not considered one of the defensive fundamentals. In defensive operations, effective defense hinges on principles that focus on maintaining a strong position, enabling coordination, and utilizing resources efficiently.

Preparation is key in defensive tactics, as it involves planning, training, and organizing units to respond effectively to threats. Concentration refers to the ability to focus combat power at decisive points, ensuring that forces are not spread too thin and can effectively counterattack or hold the line. Defense in depth involves establishing multiple layers of defense to slow down and wear out the enemy, providing time for countermeasures and adjustments.

In contrast, a quick retreat does not embody the principles of a strong defensive posture; rather, it suggests a lack of confidence or control in the situation. Instead of fortifying positions and employing defensive strategies, retreating quickly can lead to disorganization and a missed opportunity to capitalize on the prepared defensive measures.