The Office of the Administrative Assistant to the Secretary of the Army (OAA) has a primary mission, as specified in Title 10 of the United States Code and reiterated in General Orders and Regulations, to provide direct administrative and management support to Headquarters, Department of the Army (HQDA), and enterprise-level services to Army-wide organizations.

[1] In 1789 Congress enacted legislation that provided for a Chief Clerk to assist the Secretary of War.

The associated bodies significantly expanded and the title changed.

[2] The Office of the Administrative Assistant (OAA) provides direct administrative and management support to HQDA and enterprise level services to Armywide organizations.

[3] OAA has two principal components and a multitude of sub-components shown below.