What task is a tactical mission that physically renders an enemy force combat-ineffective?

The task that physically renders an enemy force combat-ineffective is understood as "Destroy." This term refers to the complete and total elimination of the enemy's capability to conduct operations. When a force is destroyed, it typically means that it can no longer regroup, rearm, or conduct any form of combat operations, thereby removing the threat entirely from the battlefield.

In contrast, the term "Defeat" could imply undermining the enemy's ability to fight effectively but does not always equate to their complete destruction; it may simply mean that they are rendered less effective or compelled to retreat. "Deceive" involves tactics aimed at misguiding the enemy, rather than directly impacting their combat effectiveness. Furthermore, "Neutralize" usually denotes a reduction in the enemy’s threat capability to a manageable level, without necessarily ensuring their complete destruction.

Thus, "Destroy" captures the essence of physically rendering an enemy force combat-ineffective more accurately than the other options.