Which responsibility focuses on the protection of the unit?

The responsibility that focuses on the protection of the unit is unit self-defense. This principle emphasizes the duty of military personnel to protect themselves and their unit from threats, ensuring their safety and the continuation of their mission. In the context of rules for the use of force, unit self-defense allows members of a unit to take necessary and proportional actions to defend against imminent threats or attacks.

Mission specific RUF pertains to the guidelines and allowances for the use of force tailored to a particular mission but does not specifically center on the immediate protection of the unit itself. Pursue and recover refers to actions taken to follow up on threats or recover personnel or resources, but again, it is not primarily focused on protection. Teach and train involves training personnel on various skills and protocols, which, while essential, does not directly address the immediate responsibility for unit protection. Thus, unit self-defense stands out as the most relevant responsibility concerning the protection of the unit.