151117-N-PO203-514 WASHINGTON (Nov. 17, 2015) Dr. David Zimmerman, professor of military history, University of Victoria, discusses his book, Top Secret Exchange: The Tizard Mission and the Scientific War, during the Office of Naval Research 75th anniversary commemoration of the Tizard Mission held at the Canadian Embassy in Washington, In 1940, Sir Henry Tizard and a small British delegation brought with them to the United States and Canada plans for more than 20 technologies, most importantly the cavity magnetron, which made possible radars that were both small and powerful. ( Navy

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151117-N-PO203-514 WASHINGTON (Nov. 17, 2015) Dr. David Zimmerman, professor of military history, University of Victoria, discusses his book, Top Secret Exchange: The Tizard Mission and the Scientific War, during the Office of Naval Research 75th anniversary commemoration of the Tizard Mission held at the Canadian Embassy in Washington, In 1940, Sir Henry Tizard and a small British delegation brought with them to the United States and Canada plans for more than 20 technologies, most importantly the cavity magnetron, which made possible radars that were both small and powerful. ( Navy photo by John F. Williams/Released)

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