sentences:  He later became part of the first United States military aviation unit, and in 1912 he became the first American enlisted man to be certified as a military pilot.Like George Wagner, Donald E. Williams grew up in Green Hill.He studied mechanical engineering at Purdue University, served as a pilot during the Vietnam War, then as a test pilot, and became a NASA astronaut in 1979; he flew on two Space Shuttle missions in the 1980s.