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.

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

Unmanned Aerial Vehicle: a remotely piloted or autonomous aircraft used for reconnaissance, surveillance, or combat missions without a human onboard.