UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date: April 15, 2016 4:00 P.M.
Form: S-4
CIK: 0000866121
Company Name: ORBITAL ATK, INC.
File Number: 333-210649
CIK: 0001585648
Company Name: Alliant Techsystems Operations LLC
File Number: 333-210649-04
CIK: 0001292472
Company Name: ATK Launch Systems Inc.
File Number: 333-210649-03
CIK: 0001305890
Company Name: ATK Space Systems Inc.
File Number: 333-210649-02
CIK: 0000820736
Company Name: ORBITAL SCIENCES CORP /DE/
File Number: 333-210649-01