The 17th Defense Systems Evaluation Squadron is an inactive United States Air Force unit. It was last assigned to the 24th Air Division of Aerospace Defense Command at Malmstrom AFB, Montana. It was inactivated on 13 July 1979. The squadron was first activated during World War II at Wheeler Field, Territory of Hawaii. It provided gunnery training to fighter aircraft of Seventh Air Force until being inactivated in the post war reduction of the United States military.