The company, in which Warren Bradford Rigdon was a former business executive for, merged with Boeing in what year?
W. Bradford Rigdon: Warren Bradford "Brad" Rigdon (born 1939) is an American engineer and former business executive at McDonnell Douglas, also known for developing the NIST Enterprise Architecture Model. McDonnell Douglas:  Between then and its own merger with Boeing in 1997, it produced a number of well-known commercial and military aircraft such as the DC-10 airliner and F-15 Eagle air-superiority fighter.
1997