Charles Andrews Lockwood was a vice-admiral and flag officer of the United States Navy. He is known in submarine history as the commander of Submarine Force Pacific Fleet during World War II. He devised tactics for the effective use of submarines, making the members and elements of "silent service" key players in the Pacific victory.

Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades.