UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date: June 10, 2015
Form: S-4
CIK: 0000866121
Company Name: ORBITAL ATK, INC.
File Number: 333-204660
CIK: 0001305890
Company Name: ATK Space Systems Inc.
File Number: 333-204660-04
CIK: 0001585648
Company Name: Alliant Techsystems Operations LLC
File Number: 333-204660-03
CIK: 0001292472
Company Name: ATK Launch Systems Inc.
File Number: 333-204660-02
CIK: 0000820736
Company Name: ORBITAL SCIENCES CORP /DE/
File Number: 333-204660-01
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