This 1931 photograph captures a Boeing P-12 pursuit biplane of the U.S. Army Air Corps parked on an airfield apron. The P-12 was among the last and most refined of the Army's biplane fighters, serving as a frontline interceptor through the early 1930s before monoplane designs rendered it obsolete. The striped rudder marking was a common identification device used at training and test fields during this era. Project: 218463