 As standard acoustic lures can't distract a wake homing torpedo, the US Navy has installed the Surface Ship Torpedo Defense on aircraft carriers that uses a Countermeasure Anti-Torpedo to home in on and destroy the attacking torpedo.The warhead is generally some form of aluminized explosive, because the sustained explosive pulse produced by the powdered aluminium is particularly destructive against underwater targets.Torpex was popular until the 1950s, but has been superseded by PBX compositions.