The Mars-class combat stores ships were a class of seven auxiliary vessels of the United States Navy. They are 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. This class has been replaced by the Lewis and Clark class dry cargo ships.