I know some of the awards earned bymy father. Crewed (tip turret gunner)on Memmigen Raid & First Shuttle to Russia. Crewed on ver 50 missions. Does he qualify for Combat Service Ribbon/Medal? Secondly, I remember him receiving a letter of thanks & a beautiful certificate from President Truman and/or Omar Bradley. Over the years after his death 1985 these documents were lost, Is there some place that I might retrieve copies?