X0202 4 2005-05-03 0 0000866121 ALLIANT TECHSYSTEMS INC ATK 0001188452 VLAHAKIS NICHOLAS G ALLIANT TECHSYSTEMS 5050 LINCOLN DRIVE EDINA MN 55436-1097 0 1 0 0 Executive VP & COO Common Stock 2005-05-03 4 A 0 3000 0 A 7777 D Common Stock 2005-05-03 4 F 0 982 68.85 D 6795 D Common Stock 1691.518 I By 401(k) Shares acquired represent payment of a Performance Share Award (PSA), and shares disposed represent shares withheld from the PSA to pay withholding taxes. /s/Nicholas G. Vlahakis 2005-05-04