What is considered the Army's primary mission?

The primary mission of the Army encompasses organizing, training, and equipping forces to conduct prompt and sustained land combat operations. This mission emphasizes the Army's fundamental role in defending the nation and responding to threats through military readiness and capability. The focus on these combat operations ensures that soldiers are prepared to effectively engage in and win conflicts that arise, reflecting the Army's core purpose within the framework of national defense.

While the other choices include important activities that the Army may engage in, such as providing humanitarian aid, supporting diplomatic missions, and ensuring domestic security, these serve as supplemental functions rather than the central mission. The primary mission remains centered around combat readiness, which is the foundation of the Army's existence and its obligation to protect and serve the interests of the nation in times of war and peace.