MDA contract will enable robotic capture and mating of Orbital's Cygnus™ Cargo Delivery Spacecraft to the ISS

For immediate release: January 19, 2010

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has received a $2.4M (USD) contract from Orbital Sciences Corporation (NYSE: ORB) to provide a critical interface that will enable capture and mating of the Cygnus™ cargo delivery spacecraft to the International Space Station (ISS). The contract also contains an option to purchase additional units for follow-on operational missions worth at least $4.0M (USD).

The Cygnus™ spacecraft is being developed by Orbital under the Commercial Orbital Transportation Services (COTS) Space Act Agreement with NASA. A demonstration flight is scheduled for early 2011 with eight subsequent operational missions to be conducted by Orbital between 2011 and 2015 under the Commercial Resupply Services (CRS) program.

Cygnus™ in-orbit operations will include autonomous close proximity operations to the ISS, but the spacecraft does not automatically berth with the station. It will be outfitted with MDA’s power and video grapple fixture in order for Canadarm2 to grapple the free-floating spacecraft. The grapple fixture is also the life-line to the spacecraft, providing power and data to keep systems in the Cygnus™ module fully powered. This proprietary interface is the industry standard that allows free-flyer spacecraft such as Cygnus™ and HTV to be captured by Canadarm2 and then mate to the ISS.

Steve Oldham, MDA’s vice president responsible for this business, commented, 'MDA’s technology is a critical interface that will continue to support both US commercial and Japanese ISS resupply missions through the life of the space station.'

About MDA

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 3,200 people in locations across the United States, the United Kingdom, and Canada. The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

Related Websites:
www.mdacorporation.com
www.orbital.com

Forward-Looking Statements
This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. with respect to future events and financial performance. The forward-looking statements in this regard include statements regarding the award of a contract. Any such forward-looking statements are based on MDA’s current expectations, estimates, projections and assumptions in light of its experience and its perception of historical trends. Any such forward-looking statements are subject to risks and uncertainties and MDA’s actual results of operations could differ materially from historical results or current expectations. The factors and assumptions underlying the forward-looking statements in this release include contracts not being terminated. Any such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from current expectations. MDA cautions readers that should certain risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary significantly from those expected. The risks that could cause actual results to differ from current expectations include changes in government priorities, funding levels, contracts and regulations; failure of third parties and subcontractors; and failure of systems to meet performance requirements.

For additional information with respect to certain of these risks or factors, plus additional risks or factors, reference should be made to the Company’s continuous disclosure materials filed from time to time with Canadian securities regulatory authorities, which are available online at www.sedar.com or on the Company’s website at www.mdacorporation.com.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.