Alliant Techsystems (NYSE: ATK ) will webcast its investor conference call on fiscal year 2007 fourth-quarter and year-end financial results, which will be announced May 4, 2007. The call will discuss ATK’s quarterly financial performance, as well as financial guidance and trend information related to the company’s expectations of future period results.

The call can be accessed via the investor relations page on ATK’s website at: . Information about downloading Windows Media Player software, which is required to access the webcast, will be available on the website. Charts referenced during the call will also be available on the website prior to the call.

Conference call details:

When: 10:00 a.m. Eastern Time, Friday, May 4

Who:Dan Murphy, Chairman and CEO
John Shroyer, Senior Vice President and Chief Financial Officer
Steve Wold, Vice President and Treasurer

For those who cannot participate in the live webcast, an audio recording of the conference call will be available for one month. The telephone number is 719-457-0820, and the confirmation code is 1621643. Institutional investors can access the call via CCBN’s password-protected event management site, StreetEvents ( ).

ATK is a $3.5 billion advanced weapon and space systems company employing approximately 15,500 people in 21 states. News and information can be found at .