Martin MB-2 (NBS-1) reproduction in the Early Years Gallery at the National Museum of the United States Air Force in Dayton, Ohio; closeup of the front half. (The MB-2's left wing has been folded back, showing how the wings folded for more compact storage.)
USAF
U.S. Air Force photo <a rel="nofollow" class="external autonumber" href="https://media.defense.gov/2015/Jul/16/2001258379/-1/-1/0/150712-F-IO108-032.JPG">[1]</a> from the <a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/197395/martin-mb-2-nbs-1/">fact sheet</a> on the museum website.