The Knox-class ships were armed with a 5"/54 caliber Mark 42 gun forward and a single 3-inch/50-caliber gun aft. They mounted an eight-round RUR-5 ASROC launcher between the gun and the bridge. Close-range anti-submarine defense was provided by two twin Mk 32 torpedo tubes. The ships were equipped with a torpedo-carrying DASH drone helicopter; its telescoping hangar and landing pad were positioned amidships aft of the mack. Beginning in the 1970s, the DASH was replaced by a SH-2 Seasprite LAMPS I helicopter and the hangar and landing deck were accordingly enlarged. Most ships also had the gun replaced by an eight-cell BPDMS missile launcher in the early 1970s.Friedman, pp. 360–61; Gardiner, Chumley & Budzbon, p. 598
