ATK Rocket Motors Help Place Classified Payload in Orbit

Four ATK (NYSE: ATK) CASTOR® IVA strap-on solid rocket motors helped successfully launch a
Lockheed Martin Atlas IIAS vehicle from Cape Canaveral Air Force Station,
Florida, yesterday. The Atlas IIAS carried a classified payload for the
National Reconnaissance Office to orbit.

ATK Thiokol has produced CASTOR IVA strap-on boosters for the Lockheed
Martin Atlas IIAS since 1993 with 100-percent launch success rate. Two of the
motors ignited at launch to provide initial thrust. The remaining two motors
ignited approximately one minute into the flight.

ATK is a $2.4 billion advanced weapon and space systems company employing
13,100 people in 23 states.

News and information can be found on the
Internet at http://www.atk.com.

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    Bryce Hallowell                          Steve Wold
    Phone:  952-351-3087                     Phone:  952-351-3056
    E-mail:  bryce.hallowell@atk.com         E-mail:  steve_wold@atk.com