This image or file is a work of a
U.S. Air Force Airman or employee, taken or made as part of that person's official duties. As a
work of the
U.S. federal government, the image or file is in the public domain in the United States.
{{Information |Description=Boeing Y1B-17 in flight |Source=http://www.nationalmuseum.af.mil/shared/media/photodb/photos/060512-F-1234S-008.jpg |Date=c. 1937 |Author=U.S. Air Force |Permission=Public Domain, U.S. Air Force photo |other_versions=N/A }} [[Ca
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