What is the primary mission of The Basic School (TBS) during Phase 3?

The primary mission of The Basic School (TBS) during Phase 3 is to prepare Marine Corps officers for leadership roles. This phase focuses heavily on developing the essential leadership skills, decision-making ability, and ethical foundation necessary for officers as they progress in their military careers. The training emphasizes the importance of leadership in various contexts, including tactical, operational, and administrative situations, equipping future leaders with the skills they will need to lead Marines effectively.

While the other options touch on various aspects of military training and functions—such as physical training, administrative support, and historical research—they do not capture the central goal of TBS in this phase. The core focus is on shaping competent and confident leaders who can guide their units and fulfill their responsibilities as officers in the Marine Corps.