Which force is kept from detection or destruction by the enemy in brigade defense?

The concept of a "Protected Force" in brigade defense refers to a unit or group of forces that is deliberately concealed or shielded from enemy detection or engagement. This strategy is crucial because it allows the protected unit to maintain a tactical advantage, ensuring that it remains intact and capable of launching decisive operations, such as counterattacks, when the time is right.

In the context of brigade defense, the protected force is often positioned in a way that minimizes its exposure to enemy surveillance and strikes. This concealment plays a vital role in operational security, enabling the force to execute its missions effectively without being undermined by enemy actions. By safeguarding this force, a brigade can retain its overall combat capability and respond more flexibly to threats as they arise.

Other forces in the options provided, like the counterattack and security forces, serve different roles and are usually more exposed to the enemy's line of sight or attacks. The main defense force is tasked with holding the frontline positions and directly engaging the enemy, which inherently increases the chances of detection. Hence, the Protected Force is specifically characterized by its focus on remaining hidden, allowing it to fulfill its purpose in a way that the other forces may not be able to, due to their functions and responsibilities in the defense