Boeing Y1B-17 BB 52 of the <a href="https://en.wikipedia.org/wiki/2nd_Operations_Group#Interwar_years" class="extiw" title="w:2nd Operations Group">2nd Bombardment Group</a>, <a href="https://en.wikipedia.org/wiki/Langley_Air_Force_Base#Inter-war_years" class="extiw" title="w:Langley Air Force Base">Langley Field</a>, Virginia.
U.S. Air Force
late 1930s <div style="display: none;">date QS:P,+1930-00-00T00:00:00Z/8,P4241,Q40719766</div>
<a rel="nofollow" class="external free" href="https://media.defense.gov/2006/Jun/01/2000554883/-1/-1/0/060512-F-1234S-007.JPG">https://media.defense.gov/2006/Jun/01/2000554883/-1/-1/0/060512-F-1234S-007.JPG</a>, from <a rel="nofollow" class="external text" href="https://www.nationalmuseum.af.mil/Upcoming/Photos/igphoto/2000554883/">gallery page</a>.