X0206 3/A 2009-01-13 2009-01-20 0 0000866121 ALLIANT TECHSYSTEMS INC ATK 0001313857 Larson Blake E 1300 WILSON BOULEVARD, SUITE 400 ARLINGTON VA 22209 0 1 0 0 Sr VP and Pres Aerospace Group Common Stock 19079 D Common Stock 631 I By Spousal Trust Common Stock 184 I By Family Trust When the reporting person's original Form 3 was filed, 3,000 shares were subject to certain restrictions including possible forfeiture applicable to restricted stock issued under the Issuer's 2005 Stock Incentive Plan. The original Form 3 reported direct beneficial ownership of 631 additional shares, which the reporting person actually indirectly beneficially owned through a trust of which the reporting person's spouse is the trustee and the reporting person is the beneficiary. These shares are held in a trust of which the reporting person's spouse is the trustee and the reporting person is the beneficiary. The original Form 3 included these shares in the total number of securities directly beneficially owned by the reporting person. These shares represent the reporting person's proportional interest as a beneficiary of his family trust. /s/Blake E. Larson 2013-04-10