The third of three SO1221s leased by the US Army for evaluation in the observation role. Delivered as 57-6106 May 12, 1958, the helicopter was quickly side lined after extensive damage occurred during an accident on December 31, 1958. It was next noted in 1971 at the Department of Aeronautics, San Jose State College, in California. The aircraft is on loan to the American Helicopter Museum by American Eurocopter (now Airbus Helicopters, Inc).