- Preserve the peace and security, and provide for the defense of the United States, the Territories, Commonwealths, and Possessions, and any areas occupied by the United States
- Support national policies
- Implement national objectives
- Overcome any nations responsible for aggressive acts that imperil the peace and security of the United States
The Army includes land combat and service forces and such aviation and water transport as may be organic therein. It will be organized, trained, and equipped primarily for prompt and sustained combat incident to operations on land. It is responsible for the preparation and sustainment of land forces necessary for the effective prosecution of war except as otherwise assigned and, according to integrated joint mobilization plans, for the expansion of the peacetime components of the Army to meet the needs of war. The Army is a total force, comprised of both active and reserve forces.