ATK Will Webcast Conference Call on Its Fourth Quarter and Fiscal Year End 2003 Financial Results.

Business Editors

MINNEAPOLIS--(BUSINESS WIRE)--April 21, 2003

ATK (Alliant Techsystems)(NYSE:ATK) will webcast its investor conference call on fiscal year 2003 fourth quarter and year end financial results, which will be announced May 8 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 page. 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, May 8, 2003.

    Who:    Paul David Miller, chairman and chief executive officer
            Eric Rangen, vice president and chief financial officer
            Mark Mele, vice president, corporate strategy and investor
              relations
            Steve Wold, director, 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 603403. 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 $2.1 billion aerospace and defense company with leading positions in propulsion, composite structures, munitions, and precision capabilities. The company, which is headquartered in Edina, Minn., employs approximately 12,000 people and has three business groups: Aerospace, Precision Systems, and Ammunition. ATK news and information can be found on the Internet at www.atk.com.