It had a length of 10 ft 2 in, a diameter of 2 ft 7.5 in, and a weight of 1,243 lb, and it carried a Mark 7 nuclear warhead with a yield of 5-10 kilotons. Its purpose was to serve as an anti-submarine weapon for the United States Navy. A test of the Mark 90 was conducted in 1955, as Operation Wigwam. All units were withdrawn from service by 1960.