Claim: Thiokol was concerned with rocket propulsion systems.
Evidence: Thiokol -LRB- 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 -RRB- was an American corporation concerned initially with rubber and related chemicals , and later with rocket and missile propulsion systems.