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For immediate release: July 19, 2006

US Government Orders Additional RADARSAT-1 Information For Surveillance

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has received an order for US$3.4 million to provide a US Government Agency with additional RADARSAT-1 information products to be delivered over a 12-month period.

The order was issued under an existing Indefinite Delivery/Indefinite Quantity (IDIQ) contract. IDIQ Contracts are utilized by US Executive Branch federal agencies to procure certain recurring services from pre-established suppliers. This purchase continues MDA’s role as a major provider of spaceborne wide-area surveillance information to the US Government, which uses it to monitor locations around the world. Continued market demand from key users underscores the value of radar satellite data as a dependable source of information crucial to government operations.

MDA’s RADARSAT-2 mission, the follow-on mission to RADARSAT-1, will provide a broader suite of higher-resolution data products once operational next year, which are expected to provide additional value in addressing the monitoring and surveillance needs of government and commercial customers around the world.

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 earth and space based information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 3,000 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.

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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. 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. Additional information on these and other potential factors that could affect MDA's financial results are detailed in documents filed from time to time with the applicable Canadian securities regulatory authorities.

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

For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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