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Sperry was a military-related industry, and its work in developing both electrically powered gun turrets for bombers and the Norden bombsight brought him to the attention of his godfather, General Arnold, by then the Chief of the United States Army Air Corps.
The Sparrowhawk entered service with the Japanese Navy in 1921, with the 10 Sparrowhawk IIIs being used for flight training operations from ramps built on one of the gun turrets of the Battleship Yamashiro, as the carrier Hōshō was not yet ready.
Gun turrets have been placed in static, land fortifications such as the Maginot Line forts in France and particularly in coastal artillery defences such as Fort Drum, the "concrete battleship", near Corregidor, Philippines.
The secondary armament consisted of four 10-inch guns mounted in four single-gun turrets positioned on each side of the superstructure.
During World War II part of the site was used to construct gun-turrets for the Bristol Blenheim fighter-bomber.
The Sally B was first fitted with accurate gun turrets and other much needed additions for her role as Ginger Rogers, a B-17 bomber of the fictitious bomber unit featured in the 1981 LWT series We'll Meet Again.