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ATK Propulsion, Composite and Space Technologies Support Successful Launch of GLAST Satellite

ATK Provides Critical Services and Subsystems for GLAST satellite

MINNEAPOLIS, June 11 /PRNewswire-FirstCall/ -- Alliant Techsystems (NYSE: ATK) propulsion and composite technologies supported the successful launch of the United Launch Alliance's Delta II Heavy rocket carrying NASA's GLAST (Gamma-ray Large Space Telescope) spacecraft with a mission to explore the most extreme environments in the Universe.

Nine GEM-46 solid propulsion strap-on boosters manufactured in ATK's Salt Lake City, Utah facility provided augmented thrust for the launch. ATK's Clearfield, Utah facility produced the composite cases for the GEM-46 boosters using an automated filament winding process developed and refined through its 40-year-heritage in composite manufacturing.

Six of the boosters ignited at lift-off with the first-stage main engine and provided over 850,000 pound maximum thrust for the launch vehicle. Just over one minute later, the remaining three boosters ignited to provide an additional 450,000 pound maximum thrust. The spent motors were jettisoned from the rocket as it continued its ascent.

ATK provided a variety of services to support the GLAST satellite. At Goddard Space Flight Center, ATK provided engineering support and lead areas of Thermal, Observatory Mechanical, Instrument System and Spacecraft Mechanical Engineer. ATK met a major challenge on the GLAST program by delivering 1,860 Crystal Detector Element (CDE) assemblies for the Naval Research Laboratory's (NRL) Large Angle Telescope (LAT) Calorimeter at 50% of estimated cost. Additionally, ATK also provided program management, mechanical design, system engineering, quality assurance, contamination control, and integration and testing support.

In addition to services, ATK provided the design, analysis and fabrication of the Tracker Tower Trays as well as the propellant tank and propellant management device.

ATK is a premier aerospace and defense company with more than 17,000 employees in 21 states and $4.5 billion in revenue. News and information can be found on the Internet at http://www.atk.com/.

     Media Contact:                          Investor Contact:

   George Torres                           Steve Wold
   Phone:  801-699-2637                    Phone:  952-351-3056
   E-mail: george.torres@atk.com           E-mail: steve.wold@atk.com

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