 Kọ itẹsiwaju fun paragirafi yii - Yato si Ẹgbẹ Olimpiiki ti 1948, Cook tun jẹ ọmọ ẹgbẹ ti awọn ẹgbẹ AMẸRIKA ni 1949 International Shooting Union World Championships, awọn 1951 Pan American Games, awọn 1952 ISU World Championships : , ati awọn 1954 ISU World Championships. Ó gba àmì ẹyẹ méjì ní 1949 World Championships àti àmì ẹyẹ kan ní 1952. Ní 1953 àti 1957 ó gba ife ẹyẹ National Gallery Rifle Championship. 