What is the primary mission of the Army?

The primary mission of the Army, as stated in the correct answer, is to support and defend the Constitution of the United States against all enemies. This mission underscores the Army's fundamental role in protecting the nation and its democratic principles, ensuring the security of the country against both external threats and potential internal conflicts. The focus on the Constitution emphasizes the Army's commitment to upholding the rights and freedoms guaranteed to all citizens.

This mission is deeply rooted in the history and purpose of the U.S. Armed Forces, reflecting a commitment to national defense and the foundational legal framework that governs the country. By prioritizing the Constitution, the Army not only defends the physical territory of the United States but also safeguards the democratic values that define the nation.

Other options, while they may involve important activities associated with national governance or social responsibilities, do not capture the essence of the Army's primary mission. Maintaining civilian order is largely the realm of law enforcement agencies, conducting international diplomacy is primarily the responsibility of the State Department, and training soldiers for civilian jobs is a supportive function that does not define the core purpose of the military.