Engineered overhaul for US Navy USS Boise Los Angeles-class submarine.

On May 8, 2020, U.S. Navy Los Angeles-class attack submarine USS Boise (SSN 764) arrived at Huntington Ingalls Industries’ Newport News Shipbuilding division in Newport News, Virginia in preparation for the submarine’s engineered overhaul (EOH).
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The Los Angeles class attack submarine, USS Boise (SSN 764) leads the fast combat support ship, USS Seattle (AOE 3) and the guided missile cruiser, USS Hue City (CG 66) as the ships of USS John F. Kennedy (CV 67) Battle Group transit the Suez Canal. (Picture source Wikimedia)

An EOH is a major multi-year overhaul near the mid-point of a submarine's service life to perform necessary repairs, maintenance and modernization, to certify the submarine for unrestricted operations and to ensure the submarine is operating at full technical capacity and mission capability.

The U.S. Navy has three classes of SSNs in service. Los Angeles-class submarines are the backbone of the submarine force, with approximately 40 now in commission. Thirty of those are equipped with 12 Vertical Launch System (VLS) tubes for firing Tomahawk cruise missiles.

The USS Boise (SSN-764) is a Los Angeles-class submarine, the second ship of the United States Navy to be named for Boise, Idaho. The contract to build her was awarded to Newport News Shipbuilding and Dry Dock Company in Newport News, Virginia on 6 February 1987 and her keel was laid down on 25 August 1988. She was launched on 23 March 1991 and commissioned on 7 November 1992.

The Los Angeles class is a nuclear-powered fast attack submarines (SSN) in service with the United States Navy. IT is armed with both the land-attack and anti-ship version of the Tomahawk missile from Raytheon that can be fitted with a nuclear warhead. The land-attack Tomahawk has a range of 2,500 km. A TAINS (Tercom Aided Inertial Navigation System) guides the missile towards the target flying at subsonic speed at an altitude of 20 m to 100 m.

The Los Angeles class submarine is fitted with four 533mm torpedo tubes located midships together with a Mark 117 torpedo fire control system. The submarine has the capacity for 26 torpedo tube launched weapons including Tomahawk missiles, Harpoon missiles and Mark 48 ADCAP torpedoes. The Gould Mark 48 torpedoes combat both high-performance surface ships and fast deep-diving submarines. The torpedo is capable of operating with or without wire guidance and uses either or both active and passive homing. It is equipped with multiple re-attack modes which operate if the target ship is missed. The torpedo carries out programmed target search, acquisition and attack procedures. It can also lay Mobile Mark 67 and Captor Mark 60 mines.