Lieutenant Colonel William Robert "Poppy" Dunn (November 16, 1916 – February 14, 1995) was the first American flying ace of World War II.
Following the outbreak of World War II, Dunn enlisted in the Canadian Army on September 7, 1939, attaining the rank of sergeant major before joining the Royal Air Force on December 13, 1940.
CWO Dunn next served as a staff officer with Headquarters, 29th Air Division at Richards-Gebaur AFB, Missouri, from July 1961 to May 1963, followed by service as a Weapons Controller with the 848th AC&W Squadron at Wallace AS in the Philippines from May 1963 to May 1964.
He served as a Weapons Officer on the staff of Headquarters, Pacific Air Forces (PACAF) at Hickam AFB, Hawaii, from May 1964 to May 1967, and then deployed to Southeast Asia, where he served as a Weapons Force Plans Officer with the 6250th Support Squadron at Tan Son Nhut AB, South Vietnam, from May 1967 to June 1968.
Dunn's final assignment was as a Weapons Controller with Headquarters, Aerospace Defense Command at Ent AFB, Colorado, from June 1968 until his retirement from the Air Force on February 1, 1973.