 Formal USAFE acceptance of the Mach 2 fighter-bombers was held at the Paris Air Show on 3 June 1961.Deliveries of the F-105D model were completed in 1963, and the 36th carried on its Cold War mission of tactical nuclear weapons delivery.Twice in the early 1960s when Cold War tensions were elevated due to the 1961 Berlin Wall crisis and 1962 Cuban Missile Crisis the 36th rose to a high level of alert.