Anti-Submarine Warfare. Capability to detect, track, and engage submarines.

Type of internal combustion engine fuel, refined from crude oil.

Military action involving the use of electromagnetic spectrum to disrupt, deceive, or destroy enemy electronic systems.

Sonar system installed on the hull of a ship, used for underwater detection and navigation by emitting and receiving sound waves.

A system of hydrophones towed behind a vessel to detect submarines and torpedoes, minimizing interference from the ship's self-noise.