value depended not so much on their ability to detect a submarine previous to its attack . . . but on the certainty of their locating the submarine after a torpedo attack, with the resultant destruction of the submarine by depth charges from either the airship or surface escort." Operators United States Navy Specifications (Curtiss-built B-type) See also List of airships of the United States Navy References 1910s United States patrol aircraft Airships of the United States Navy Aircraft first flown in 1917