Which battle drill is primarily concerned with breaking contact?

The battle drill that is primarily concerned with breaking contact is Battle Drill 3. This drill is focused on ensuring that a unit can disengage effectively from an enemy engagement when needed, allowing them to reposition or escape without sustaining excessive casualties.

Breaking contact is a critical tactical maneuver, often conducted under combat conditions when it is necessary to withdraw from an unfavorable situation. In Battle Drill 3, soldiers are trained to perform specific actions, such as establishing a support-by-fire position and conducting a tactical withdrawal, ensuring that the unit can disengage while still maintaining operational security and minimizing the chance of being overrun or flanked.

In contrast, other battle drills like Battle Drill 2A involves actions such as reacting to contact and organizing a counterattack, while Battle Drill 5 focuses on entering and clearing a room. Battle Drill 9 is related to conducting a tactical recovery of personnel and equipment, which does not primarily address the concept of breaking contact from an engagement. Thus, the emphasis of Battle Drill 3 on disengagement tactics makes it the correct answer to this question.