The reverse side of a 1941 snapshot, hand-captioned 'B-18, BC-1 and a P-40, Rio Hato Air Fld, Panama, Sept 1941.' This annotation documents U.S. Army Air Corps aircraft stationed at Rio Hato Airfield in the Panama Canal Zone in the months before America's entry into World War II, when air units were forward-deployed to defend the strategically vital Panama Canal. Project: 218550