Kenneth O. Chilstrom

Kenneth O. "K.O." Chilstrom (born April 20, 1921) is a retired United States Air Force officer, combat veteran, test pilot, and author. He was the first USAF pilot to fly the XP-86 Sabre, chief of fighter test at Wright Field, commandant of the U.S. Air Force Test Pilot School, and program manager for the XF-108 Rapier. 
Chilstrom was a pilot in the first jet air race and delivered the first air mail by jet. He flew over eighty combat missions in the Italian Campaign of World War II.