ATK Awarded $25 Million Contract Option to Produce LW30mm M789 HEDP

LW30mm Provides Firepower for Apache Helicopters

MINNEAPOLIS, Oct. 5 /PRNewswire-FirstCall/ -- Alliant Techsystems (NYSE: ATK)
has been awarded a $25 million contract option to provide lightweight (LW)
30mm M789 High Explosive Dual Purpose (HEDP) tactical ammunition for the
AH-64D Apache attack helicopter. The U.S. Army Contracting Command, Rock
Island Contracting Center, Rock Island, Ill., awarded the contract. This
option is in addition to an $86 million base award that ATK announced in July.
Production on this contract option will begin in March 2011 at the company's
facilities in Radford, Va. and Rocket Center, W.Va.

ATK produces more than eight million rounds of medium-caliber ammunition per
year, including the revolutionary air-bursting rounds it developed for the
U.S. Navy and Marine Corps, and a complete suite of ammunition for ATK's new
LW 25mm chain gun. The company is a leading supplier of integrated
medium-caliber systems that include medium-caliber cannons, ammunition, and
electronics and fire control, delivering affordable and innovative technology
to provide enhanced solutions and capabilities to customers worldwide.

ATK is a premier aerospace and defense company with more than 18,000 employees
in 22 states, Puerto Rico and internationally, and revenues of approximately
$4.8 billion. News and information can be found on the Internet at
www.atk.com.

Certain information discussed in this press release constitutes
forward-looking statements as defined in the Private Securities Litigation
Reform Act of 1995. Although ATK believes that the expectations reflected in
such forward-looking statements are based on reasonable assumptions, it can
give no assurance that its expectations will be achieved. Forward-looking
information is subject to certain risks, trends and uncertainties that could
cause actual results to differ materially from those projected. Among those
factors are: changes in governmental spending, budgetary policies and product
sourcing strategies; the company's competitive environment; the terms and
timing of awards and contracts; and economic conditions. ATK undertakes no
obligation to update any forward-looking statements. For further information
on factors that could impact ATK, and statements contained herein, please
refer to ATK's most recent Annual Report on Form 10-K and any subsequent
quarterly reports on Form 10-Q and current reports on Form 8-K filed with the
U.S. Securities and Exchange Commission.

Media Contact: Investor Contact:
Amanda Covington Jeff Huebschen
Phone: 801-779-4625 Phone: 952-351-2929
E-mail: amanda.covington@atk.com E-mail: jeff.huebschen@atk.com

SOURCE ATK

Media, Amanda Covington, +1-801-779-4625, amanda.covington@atk.com, or
Investors, Jeff Huebschen, +1-952-351-2929, jeff.huebschen@atk.com, both of
ATK