lt col richard ` dick ' cole , 99 , gave the medal to air force museum director .
staff sgt david thatcher , 93 , came from missoula , montana , for the event .
ceremony 73 years to day after their bombing of japan rallied us in wwii .
military and political officials and relatives of original 80 raiders attended .
the group 's congressional gold medal arrived in a ceremonial b-25 flight .