FedFlix - US government films - (archive.org)
"Joint Venture between the National Technical Information Service and Public.Resource.Org. Here we feature the best movies of the United States Government, from training films to history, from our national parks to the U.S. Fire Academy and the Postal Inspectors, all of these fine flix are available for reuse without any restrictions whatsoever."
These clips have archival, historical and cultural relevance. Note that they are a product of their times and may not reflect modern sensibilities or attitudes. Films can be viewed in the browser window or downloaded. Preview before using.