MacDonald, Dettwiler and Associates Ltd. (“MDA” or the “Company”) (TSX:MDA), a global communications and information company, today announced that it has received a contract amendment from Orbital ATK for additional interface units to enable capture and berthing of its Cygnus commercial resupply spacecraft to the International Space Station. MDA has provided previous interface units to Orbital ATK as announced in January 2010.

About MDA

MDA is a global communications and information company providing operational solutions to commercial and government organizations worldwide.

MDA’s business is focused on markets and customers with strong repeat business potential, primarily in the Communications sector and the Surveillance and Intelligence sector. In addition, the Company conducts a significant amount of advanced technology development.

MDA’s established global customer base is served by more than 4,800 employees operating from 11 locations in the United States, Canada, and internationally.

The Company’s common shares trade on the Toronto Stock Exchange under the symbol “MDA.”

About Orbital ATK

Orbital ATK is a global leader in aerospace and defense technologies. The company designs, builds and delivers space, defense and aviation systems for customers around the world, both as a prime contractor and merchant supplier. Its main products include launch vehicles and related propulsion systems; missile products, subsystems and defense electronics; precision weapons, armament systems and ammunition; satellites and associated space components and services; and advanced aerospace structures. Headquartered in Dulles, Virginia, Orbital ATK employs more than 12,000 people in 18 states across the U.S. and in several international locations. For more information, visit www.orbitalatk.com.

Related Websites

www.mdacorporation.com
www.orbitalatk.com