X0202 4 2007-05-16 0 0000866121 ALLIANT TECHSYSTEMS INC ATK 0001188447 DEYOUNG MARK W ALLIANT TECHSYSTEMS INC. 5050 LINCOLN DRIVE EDINA MN 55436-1097 0 1 0 0 Sr VP & Pres Ammo Sys Group Common Stock 2007-05-16 4 M 0 5000 59.12 A 21105 D Common Stock 2007-05-16 4 M 0 10000 57.43 A 31105 D Common Stock 2007-05-16 4 S 0 500 98.77 D 30605 D Common Stock 2007-05-16 4 S 0 600 98.78 D 30005 D Common Stock 2007-05-16 4 S 0 100 98.79 D 29905 D Common Stock 2007-05-16 4 S 0 100 98.81 D 29805 D Common Stock 2007-05-16 4 S 0 200 98.82 D 29605 D Common Stock 2007-05-16 4 S 0 1100 98.83 D 28505 D Common Stock 2007-05-16 4 S 0 200 98.87 D 28305 D Common Stock 2007-05-16 4 S 0 300 98.91 D 28005 D Common Stock 2007-05-16 4 S 0 400 98.96 D 27605 D Common Stock 2007-05-16 4 S 0 300 98.98 D 27305 D Common Stock 2007-05-16 4 S 0 200 99.00 D 27105 D Common Stock 2007-05-16 4 S 0 100 99.01 D 27005 D Common Stock 2007-05-16 4 S 0 1000 99.02 D 26005 D Common Stock 2007-05-16 4 S 0 100 99.03 D 25905 D Common Stock 2007-05-16 4 S 0 800 99.05 D 25105 D Common Stock 2007-05-16 4 S 0 100 99.06 D 25005 D Common Stock 2007-05-16 4 S 0 600 99.08 D 24405 D Common Stock 2007-05-16 4 S 0 100 99.09 D 24305 D Common Stock 2007-05-16 4 S 0 400 99.10 D 23905 D Common Stock 2007-05-16 4 S 0 300 99.12 D 23605 D Common Stock 2007-05-16 4 S 0 300 99.13 D 23305 D Common Stock 2007-05-16 4 S 0 700 99.14 D 22605 D Common Stock 2007-05-16 4 S 0 400 99.15 D 22205 D Common Stock 2007-05-16 4 S 0 500 99.16 D 21705 D Common Stock 2007-05-16 4 S 0 200 99.17 D 21505 D Common Stock 2007-05-16 4 S 0 100 99.18 D 21405 D Common Stock 2007-05-16 4 S 0 600 99.20 D 20805 D Common Stock 2007-05-16 4 S 0 200 99.21 D 20605 D Employee Stock Option (right to buy) 59.12 2007-05-16 4 M 0 5000 0 D 2013-01-21 Common Stock 5000 0 D Employee Stock Option (right to buy) 57.43 2007-05-16 4 M 0 10000 0 D 2011-01-20 Common Stock 10000 0 D Options became exercisable in three equal annual installments beginning January 21, 2004. Options became exercisable on January 20, 2007. This is the first of three parts of a form 4 filed on 5/17/07. /s/Mark W. DeYoung 2007-05-17