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@nara.gov
National Archives Identifier: 36266
Local Identifier: 111-TF-2035
National Archives Catalog (series): catalog.archives.gov/id/36266
For more information about the making of this film, read this post on the National Archives Unwritten Record blog: unwritten-record.blogs.archiv...