1917-Vietnam; and for units that served in Southeast Asia; contact:
Archives II Textual Reference Branch - email is linked below.
National Archives and Records Administration (NARA)
8601 Adelphi Road
College Park, MD 20740
For post-Vietnam Unit Operational Records: Army records are managed under an approved National Archives and Records Administration (NARA) records disposition schedule. These records schedules tell an agency when to transfer permanent records to NARA or when they can legally dispose of non-permanent records. The general rule of thumb is if Army records are older than 30 years and not needed to conduct agency business, they should have been transferred into NARA's custody.
Anything less than 30 years but older than one year will most likely still be retained by the:
U.S. Army Records Management Declassification Agency - website linked below.
Room 102, Casey Building
7701 Telegraph Road Alexandria, VA 22315