Mars-class combat stores ship

USS Mars (AFS-1), lead ship of the class
Class overview
BuildersNational Steel and Shipbuilding Company
Operators United States Navy
Succeeded byLewis and Clark-class dry cargo ship
Built1962-1970
In commission1963-1998
Completed7
Retired7
General characteristics
TypeCombat stores ship
Displacement
  • 9,200 long tons (9,348 t) light
  • 15,900–18,663 long tons (16,155–18,962 t) full load
Length581 ft (177.1 m)
Beam79 ft (24.1 m)
Draft28 ft (8.5 m)
Propulsion
  • 3 × Babcock & Wilcox boilers, 580 psi (3.7 MPa); 825 °F (440 °C)
  • 1 × De Laval turbine
  • 22,000 shp (16.4 MW) sustained
  • 1 shaft
Speed21 knots (39 km/h; 24 mph)
Complement486 officers and enlisted men (in Navy commission); 26 Navy personnel, 118 civilians (Military Sealift Command)
Sensors and
processing systems		Mark 56 fire-control system
Armament
  • 4 × 3"/50 caliber guns (2×2) (originally 8 (4x2))
  • Chaff Launchers
  • 4 × M240G 7.62×51mm medium machine guns or M249 5.56×45mm light MG
  • 1 M2 12.7×99mm heavy machine gun when security detachment is embarked
Aircraft carried2 × UH-46 Sea Knight helicopters

The Mars-class combat stores ships were a class of seven auxiliary vessels of the United States Navy. The ships were designed for underway replenishment, in support of carrier task force groups, carrying miscellaneous stores and munitions. Initially they carried no fuel oil or liquid cargo, but by the early 1990s the class was refitted with limited refuel capacities for F-76 fuel. None of the original seven ships originally commissioned by the US Navy remain in service. The Mars class was replaced by the Lewis and Clark-class dry cargo ships.

Cargo capacity of the each ship was approximately 7,000 tons in five holds, with hangar space for two UH-46 helicopters.