150917-N-PO203-143 ARLINGTON, Va. (Sept. 17 2015) Unboxing of a World War II era cavity magnetron, an effective high-power radar transmitter, which revolutionized the form and function of all future radars allowing effective, small target detection capability to be incorporated into aircraft and ships. Seventy-five years ago, a British delegation under the leadership of Sir Henry Tizard, came to Washington D.C., and met with Rear Adm. Harold Bowen, who later became the first chief of naval research, and a team of scientists at the Naval Research Laboratory, to put in motion this warfighting advancement that changed the course of the War. (U.S. Navy photo by John F. Williams/Released)