What is a characteristic of defense according to ATP 3-21.8?

Preparation is a fundamental characteristic of defense as outlined in ATP 3-21.8. In a defensive operation, preparation involves organizing forces, establishing positions, and creating an environment conducive to effective defensive action. Well-prepared units can leverage their defensive positions to optimize their strengths while minimizing vulnerabilities.

Preparation ensures that soldiers are equipped with the necessary information and resources to respond effectively to enemy actions, including intelligence about potential enemy movements or tactics. It allows for the establishment of clear communication lines, logistical support systems, and the reinforcement of positions to sustain operations over time.

In contrast, options such as surprise and deception are tactical maneuvers often used to gain an advantage, but they do not fundamentally describe the characteristic of defense itself. Defense in-depth refers to the practice of establishing multiple layers of defense, which is a strategy rather than a characteristic. Therefore, preparation is crucial in creating a solid defensive posture that can withstand enemy attacks and maintain operational effectiveness.