Thiokol became part of Orbital ATK and it was American .
Thiokol , variously Thiokol Chemical Corporation , Morton-Thiokol Inc. , Cordant Technologies Inc. , Thiokol Propulsion , AIC Group , ATK Thiokol ; finally ATK Launch Systems Group before becoming part of Orbital ATK , was a Canadian corporation concerned initially with rubber and related chemicals , and later with rocket and missile propulsion systems .
Thiokol