San Antonio-class Amphibious Transport Dock
The amphibious transport dock Portland (LPD 27) is the eleventh ship in the LPD 17 class. LPD 27 is named to honor the city of Portland, Oregon, also called the City of Roses. It is the third ship named Portland, including CA 33 (named for Portland, Maine), which earned 16 Battle Stars in World War II and LSD 37, an amphibious landing ship.
The primary mission of the ship will be to embark, transport and land U.S. Marine Corps landing forces in a variety of expeditionary and special operations missions, while providing command and control, communications connectivity and medical services. The ship will support its embarked Marines and Sailors with amphibious assault vehicles (AAVs), landing craft air cushion (LCAC) vessels, MV-22 Osprey tilt-rotor aircraft and CH-46 Sea Knight helicopters.
Characteristics of the San Antonio-class:
Propulsion: Four Colt-Pielstick diesel engines, two shafts, 40,000 hp (30 MW)
Length: 208.5 m (684 ft) overall
Beam: 31.9 m (105 ft) extreme
Displacement: 25,000 tons full
Speed: 22 knots (41 km/h)
Crew: 28 officers, 332 enlisted Sailors and 3 Marines
Embarked: Marine Expeditionary Force of 66 officers, 633 enlisted (surge to 800)
Aircraft: Four CH-46 Sea Knight helicopters and two MV-22 tilt rotor aircraft may be launched or recovered simultaneously.
Boats and Landing craft: Two LCACs, one LCU and 14 AAVs
Armament: Two 30 mm Bushmaster II cannons, for surface threat defense; two Rolling Airframe Missile (RAM) launchers for air defense