Boeing P-8 Poseidon. Developed originally for the U.S. Navy by Boeing Defense, Space & Security from a 737-800erx passenger jet. It is used for anti-submarine warfare (ASW), anti-surface warfare (ASUW), and shipping interdiction, along with an electronic signals intelligence (ELINT) role. The P-8 carries torpedoes, depth charges, SLAM-ER missles and other weapons. It can also drop and monitor sonobuoys.