The O-47 was an observation fixed-wing aircraft used by the Army Air Corps and intended as a replacement for earlier observation biplanes. Note the windows in the belly to overcome the obscured visibility from the wings for downward observation and photography. Proving flights demonstrated the O-47 was too large and heavy and it was soon relegated to duties such as towing targets and coastal patrol. This example is on display at the National Museum of the USAF as 37-328 in the markings from the 112th OS of the Ohio NG, but it is actually ex 39-112.
This photo was added on 24 April 2018, and has since been viewed 54 times.