ATK Will Webcast Conference Call on Its First Quarter Fiscal Year 2007 Financial Results.

MINNEAPOLIS -- ATK (Alliant Techsystems) (NYSE:ATK) will webcast its investor conference call on fiscal year 2007- first quarter financial results, which will be announced August 3, 2006, prior to the opening of the market. Conference call details are as follows:

This call is being webcast by CCBN and can be accessed at ATK's web site at www.atk.com, Investor Relations; Investor Information; Webcasts. Information about downloading Windows Media Player software, which is required to access the webcast, will be available on the website.

When:   10:00 a.m. Eastern Time, Thursday, August 3, 2006.

Who:    Dan Murphy, chairman and chief executive officer
        John Shroyer, senior vice president
            and chief financial officer
        Steve Wold, vice president, investor relations

Telephone recording: For those who cannot participate in the live webcast, a telephone recording of the conference call will be available. The telephone number is 719-457-0820, and the confirmation code is 9707426. The recording will be available for one month after the call.

Institutional investors can access the call via CCBN's password- protected event management site, StreetEvents (www.streetevents.com).

ATK is a $3.4 billion advanced weapon and space systems company employing approximately 15,000 people in 22 states. 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, reference should be made to ATK's filings with the Securities and Exchange Commission, including quarterly reports on Form 10-Q, current reports on Form 8-K, and ATK's Annual Report on Form 10-K for the fiscal year ended March 31, 2006.