ATK Will Webcast Conference Call on Its First Quarter Fiscal Year 2008 Financial Results.

MINNEAPOLIS -- ATK (Alliant Techsystems)(NYSE: ATK) will webcast its investor conference call on fiscal year 2008-first quarter financial results, which will be announced August 2, prior to the opening of the market. In addition to discussion of the quarterly results, the Company may discuss its outlook and financial guidance for future periods during the call. 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 2, 2007.

Who:  Dan Murphy, Chairman and Chief Executive Officer
      John  Shroyer, Senior Vice President and Chief Financial Officer
      Steve Wold, Vice President, Treasurer and 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 6818564. 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 $3.9 billion advanced weapon and space systems company employing approximately 16,500 people in 21 states. News and information can be found on the Internet at www.atk.com.

The information in this presentation includes forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. Although we believe that the expectations reflected in those statements are based on reasonable assumptions, we can give no assurance that those expectations will be achieved. Forward-looking information is subject to certain risks, trends, and uncertainties that could cause actual results to differ materially from projections. Among these factors are: delays in NASA's Space Shuttle program; changes in governmental budgets, spending, and product sourcing strategies; the company's competitive environment; risks inherent in the development and manufacture of advanced technology; increases in prices of commodities, energy and production costs; contract terms and timing; program performance; the outcome of contingencies, including litigation and environmental remediation; pension asset returns and assumptions on future returns, discount rates, service costs and funding; access to capital markets and the costs thereof; changes in accounting standards and tax regulations; economic conditions; and the company's capital deployment strategies, including debt repayment, share repurchases, mergers and acquisitions, and any integration thereof. ATK undertakes no obligation to update any forward-looking statements. For further information on factors that could impact ATK and the 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.