Military Pay Operations performs the installation-level military support for the Army across the United States and Japan. The MPO headquarters in Indianapolis manages 35 Army Military Pay Offices, formerly known as Defense Military Pay Offices, and 14 satellite offices at 49 locations.

The AMPOs perform the full range of military pay services to include in and out-processing, input of transactions generated by orders and forms from Army units and activities, and separations. At select installations, the AMPOs process accession transactions for new Soldiers.

The AMPOs also support the strategic readiness of the Army through support of mobilization/demobilization and Soldier Readiness Processing prior to deployments. When collocated with a financial management support unit, the AMPO and financial management support unit network as a team to provide installation military pay support.