The primary role of the Lewis and Clarks is to provide logistic lift from supply sources such as friendly ports, or while at sea, from specially equipped merchant ships by consolidation. Lewis and Clarks will transfer cargo (ammunition, food, limited quantities of fuel, repair parts, ship store items, and expendable supplies and material) to station ships and other naval warfare forces. As auxiliary support ships, Lewis and Clarks will directly contribute to the Navy's ability to maintain a forward presence. When operating together with Henry J. Kaiser-class oilers Lewis and Clarks will provide the carrier battle group and/or amphibious readiness group with product lift equivalent to a Supply-class fast combat support ship.