ATK Board of Directors Declares Quarterly Dividend.

MINNEAPOLIS, May 3, 2011 /PRNewswire/ -- ATK (NYSE: ATK) today announced that its Board of Directors has declared a quarterly cash dividend of $0.20 per share. The dividend will be payable June 30, 2011, to stockholders of record as of June 6, 2011.

ATK is an aerospace, defense, and commercial products company with operations in 23 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