Its last assignment was with the 4708th Air Defense Wing at Selfridge Air Force Base , Michigan , where it was inactivated in 1955 .
The 575th Air Defense Group is a disbanded United States Air Force organization .
Air Defense Group 's last assignment was with the 4708th Air Defense Wing at Selfridge Air Force Base , Michigan , where it was inactivated in 1955 .
The 575th Air Defense Group is a disbanded United States Air Force organization .