HMS Somerset making a high speed turn - from the bow are the 4.5 gun, vertical launch battery for Seawolf and the quadruple launchers for Harpoon. Amidships, slightly forward, either side of the funnel are close-defence AAA positions - at the time of this photo 30mm cannon but nowadays Phalanx. Decoy and chaff launchers are fitted along the deck and super-structure. Decoys are small missiles that lure and confuse a sea-skimming missile. Chaff is a round which bursts near the ship, throwing out clouds of plastic shards to confuse the radar homing on a sea-skimming missile. Tubes for anti-submarine torpedoes are fitted aft.