The PostOfficeDepartment was the former name of the United States Postal Service when it was a Cabinet department.
During the Civil War, postal services in the Confederacy were provided by the Confederate Post-office Department, headed by Postmaster General John Henninger Reagan.
The Postal Reorganization Act signed by President Richard Nixon on August 12, 1970, replaced the cabinet-level PostOfficeDepartment with the government-owned corporation, the United States Postal Service.
In 1971, the department was reorganized as a quasi-independent agency of the federal government and acquired its present name.
The Department of Defense and the USPS jointly operate a postal system to deliver mail for the military; this is known as the Army PostOffice (for Army and Air Force postal facilities) and Fleet PostOffice (for Navy, Marine Corps and Coast Guard postal facilities).
A branch or postoffice branch, a postal facility that is not the main postoffice and that is outside the corporate limits of the community.