Martin MB-2 (NBS-1) reproduction in the Early Years Gallery at the National Museum of the United States Air Force in Dayton, Ohio. (This wide-angle photo was taken with a fish-eye lens, hence the distortion.)
USAF
U.S. Air Force photo <a rel="nofollow" class="external autonumber" href="https://media.defense.gov/2010/Jul/14/2000343495/-1/-1/0/100714-F-1234S-001.JPG">[1]</a> from the <a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/Upcoming/Photos/igphoto/2000343495/">image gallery</a> on the museum website.