Our Mission MPSA mission is to achieve efficient and responsive processing, transportation, and distribution of personal and official mail within the Department of Defense. Our Profile Until 1980, each military service and government agency managed its own mail program. In 1980, the Department of Defense designated the Secretary of the Army as the single military mail manager. The Military Postal Service Agency (MPSA) was created to perform this task, with a jointly-staffed headquarters located in the National Capital Region. MPSA is required to adhere to United States Postal Service (USPS) rules, federal laws, and various international laws and agreements for movement of military mail into over 85 countries. MPSA is the single DoD point of contact with the USPS. It conducts DoD contingency planning and provides postal support to theater Combatant Commanders through Services' theater postal commands. It serves as a proponent of DoD's cost control policy for DoD official mail and as the functional director for military mail. MPSA also monitors transportation funds dedicated to overseas mail movement.