39 U.S.C. § 406 : US Code - Section 406: Postal services at Armed Forces installations

Search 39 U.S.C. § 406 : US Code - Section 406: Postal services at Armed Forces installations

(a) The Postal Service may establish branch post offices at
camps, posts, bases, or stations of the Armed Forces and at defense
or other strategic installations.
(b) The Secretaries of Defense and Transportation shall make
arrangements with the Postal Service to perform postal services
through personnel designated by them at or through branch post
offices established under subsection (a) of this section.