What is a key characteristic of the defense according to military doctrine?

A key characteristic of defense in military doctrine is flexibility. This adaptability allows a defending force to respond effectively to a wide range of threats and tactics employed by an opposing force. Flexibility is crucial because it enables a military unit to adjust its defensive measures in response to changing battlefield conditions, enemy movements, and tactics.

For example, a flexible defense can involve shifting resources to reinforce vulnerable areas, altering troop formations, or employing different types of weaponry as the situation evolves. This adaptability is essential for maintaining the integrity of the defense and ensuring that opposing forces cannot easily predict or exploit weaknesses.

The other options do not capture the essence of an effective defensive posture. Indecision would undermine any defensive strategy, as it suggests an inability to act decisively when under threat. Predictability could lead to vulnerabilities, as an enemy could exploit known patterns and responses. Isolation, while it may hint at the concept of holding a position or a sector, does not encompass the dynamic nature of defense that requires a comprehensive and responsive approach to threats.