X0202 4 2006-05-10 0 0000866121 ALLIANT TECHSYSTEMS INC ATK 0001307731 Dolby Michael B ALLIANT TECHSYSTEMS INC. 5050 LINCOLN DRIVE EDINA MN 55436-1097 0 1 0 0 VP Corporate Development Common Stock 2006-05-10 4 M 0 3589 47.7467 A 3873 D Common Stock 2006-05-10 4 M 0 3183 59.12 A 7056 D Common Stock 2006-05-10 4 S 0 6600 83.72 D 456 D Common Stock 2006-05-10 4 S 0 172 83.92 D 284 D Common Stock 2430.1 I By 401(k) plan Employee Stock Option (right to buy) 47.7467 2006-05-10 4 M 0 3589 0 D 2012-01-22 Common Stock 3589 0 D Employee Stock Option (right to buy) 59.12 2006-05-10 4 M 0 3183 0 D 2013-01-21 Common Stock 3183 0 D The amount reported includes 284 shares held in the Issuer's Employee Stock Purchase Plan as of March 31, 2006. Based on an on-line summary dated May 10, 2006. Options became exercisable in three equal annual installments beginning 01/22/2003. Since the date of the reporting person's initial statement of beneficial ownership of these securities, he transferred employee stock options to purchase (a) 3,161 shares of ATK common stock with an expiration date of 01/22/2012 and (b) 1,817 shares of ATK common stock with an expiration date of 01/21/2013 to his ex-wife pursuant to a domestic relations order. The reporting person no longer reports as beneficially owned any securities owned by his ex-wife. Options became exercisable in three equal annual installments beginning 01/21/2004. /s/Michael B. Dolby 2006-05-10