ATK President and Chief Executive Officer Mark DeYoung to Speak at the Macquarie Industrials Conference

MINNEAPOLIS, May 10, 2010 /PRNewswire via COMTEX/ -- Alliant Techsystems (NYSE: ATK) will webcast the remarks of its President and Chief Executive Officer, Mr.

Mark DeYoung, when he appears at the Macquarie Industrials Conference in New York, NY on May 12, 2010. Mr. DeYoung is scheduled to provide formal comments to the conference attendees beginning at 10:45 am (EDT).

Access to the audio-only webcast will be available at: http://www.atk.com/InvestorRelations/investrelate_investorinfo.asp. A replay of the webcast will be available on the company's website within 24 hours after the presentation and will remain on the site for 90 days.

ATK is a premier aerospace and defense company with more than 18,000 employees in 24 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.

Media Contact: Investor Contact:

Bryce Hallowell Jeff Huebschen

Phone: 952-351-3087 Phone: 952-351-2929

E-mail: bryce.hallowell@atk.com E-mail: jeff.huebschen@atk.com SOURCE ATK www.prnewswire.com Copyright (C) 2010 PR Newswire. All rights reserved -0- KEYWORD: Minnesota