Exhibit 21

Subsidiaries of Alliant Techsystems Inc.

as of March 31, 2011

All subsidiaries listed below are 100% owned except where noted.

Subsidiaries				State or Other Jurisdiction of Incorporation or Organization
·	Alliant Techsystems Operations, LLC				Delaware
·	ATK Commercial Ammunition Holdings Company Inc.				Delaware
	·	ATK Commercial Ammunition Company Inc.			Delaware
		·	Federal Cartridge Company		Minnesota
		·	Ammunition Accessories Inc.		Delaware
·	ATK Launch Systems Inc.				Delaware
·	ATK Space Systems Inc.				Delaware
	·	COI Ceramics, Inc. (65% ownership)			California
	·	ViviSat LLC (50% interest)			Delaware
·	ATK Insurance Company				Vermont
·	Eagle Industries Unlimited, Inc.				Missouri
	·	Eagle Mayaguez, LLC			Missouri
		·	Front Line Defense International, Inc.		Puerto Rico
	·	Eagle New Bedford, Inc.			Missouri
	·	Eagle Industries del Caribe, Inc.			Puerto Rico
	·	Eagle Industries International, Inc.			Bahamas