151117-N-PO203-391 WASHINGTON (Nov. 17, 2015) Dr. John Holdren, assistant to the president for science and technology and director of the White House office of science and technology policy, provides a keynote address 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, including the cavity magnetron, which made possible radars that were both small and powerful. (

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151117-N-PO203-391 WASHINGTON (Nov. 17, 2015) Dr. John Holdren, assistant to the president for science and technology and director of the White House office of science and technology policy, provides a keynote address 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, including the cavity magnetron, which made possible radars that were both small and powerful. ( Navy photo by John F. Williams/Released)

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