Amphibious transport dock ships are warships that embark, transport and land elements of a landing force for a variety of expeditionary warfare missions.
Features LPDs are used to transport and land Marines, their equipment and supplies by embarked Landing Craft, Air Cushion (LCAC) or conventional landing craft and amphibious assault vehicles (AAV) augmented by helicopters or vertical take-off and landing aircraft (MV 22). These ships support amphibious assault, special operations or expeditionary warfare missions and can serve as secondary aviation platforms for amphibious ready groups.
Background The LPD 17 San Antonio class is the functional replacement of over 41 ships from the following: LPD 4 Austin class, LSD 36 Anchorage class, LKA 113 Charleston class and LST 1179 Newport class amphibious ships. The San Antonio class provides the Navy and Marine Corps with modern, sea-based platforms that are networked, survivable and built to operate with 21st century transformational platforms, such as the MV-22 Osprey, the upgraded Amphibious Assault Vehicle and future means by which Marines are delivered ashore.
Construction on USS San Antonio (LPD 17), the first ship of the class, commenced in June 2000 and was delivered to the Navy in July 2005. USS Portland (LPD 27), the eleventh ship of the class, delivered in 2017. USS New York (LPD 21) was the first of three LPD 17-class ships built in honor of the victims of the Sept. 11, 2001 terrorist attacks. The ship's bow stem was cast using 7.5 tons of steel salvaged from the World Trade Center. The Navy named the eighth and ninth ships of the class, Arlington and Somerset, in honor of the victims of the attacks on the Pentagon and United Flight 93, respectively. Materials from those sites were also incorporated into Arlington and Somerset. LPD 28 is currently under construction at Huntington Ingalls Industries (HII) on the Gulf Coast. The Navy is working to award the detail design and construction contract of LPD 29. As the 13th San Antonio class ship, LPD 29 will perform the same missions as the previous 12 ships of the class while incorporating technically feasible cost reduction initiatives and class lessons learned.
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General Characteristics, San Antonio Class LPD
Builder: Huntington Ingalls Industries
Propulsion: Four sequentially turbocharged marine Colt-Pielstick Diesels, two shafts, 41,600 shaft horsepower
Length: 684 ft
Beam: 105 ft
Displacement: Approximately 24,900 long tons (25,300 metric tons) full load