Sailors, Marines and civilians with the Navy Munitions Command Unit Charleston and Marine Corps Systems Command offload cargo from the USNS Lewis and Clark (T-AKE-1) March, 25, 2015, at Naval Weapons Station Wharf Alpha, Charleston, S.C. The Lewis and Clark is a replenishment naval vessel. In 2012, USNS Lewis and Clark became one of 12 ships that comprise the United States Marine Corps Maritime Prepositioning Program. Prepositioning ships provide quick and efficient movement of military equipment/supplies between operating areas without reliance on other nations' transportation networks. These ships give U.S. regional combatant commanders the assurance that they will have what they need to quickly respond in a crisis - anywhere, anytime. (U.S. Air Force photo/Airman 1st Class Clayton Cupit)