| 
              
                | First Flight
 | Model | Military
                  Number | Name |  
                | 1946 | 6000C4 | XLR111 |  |  
                | 1960 |  | XLR99 | Pioneer |  |  | Reaction
            Motors Inc. was formed in 1941 by four members of the American Rocket
            Society.  The company developed the rocket engines used by the
            the early NASA (NACA)/Air Force X planes including the Bell X-1 that
            first broke the sound barrier in 1947 and the famous North American
            X-15. Reaction Motors was taken over by Thiokol Chemical
            in 1958 to become the Reaction  Motor Division. 
            Later the division became Thiokol Propulsion which was
            acquired by ATK (Alliant Techsystems) in 2001. |