Security on the March - Mechanized Units

Creator(s): War Department. Office of the Chief Signal Officer. 8/1/1866-9/18/1947 (Most Recent) Record Group 111: Records of the Office of the Chief Signal Officer, 1860 - 1985 Contact(s): National Archives at College Park - Motion Pictures (RDSM), National Archives at College Park, 8601 Adelphi Road College Park, MD 20740-6001 Phone: 301-837-3540, Fax: 301-837-3620, Email: mopix@ National Archives Identifier: 36266 Local Identifier: 111-TF-2035 National Archives Catalog (series): For more information about the making of this film, read this post on the National Archives Unwritten Record blog: