Sailors, Marines and civilians with the Navy Munitions Command Unit Charleston and Marine Corps Systems Command prepare the loading zone for uploading cargo to the USNS Lewis and Clark (T-AKE-1) Aug. 25, 2015, at Joint Base Charleston - Weapons Station Wharf Alpha, 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 provides quick and efficient movement of military equipment/supplies between operating areas without reliance on other nations' transportation networks. These ships assure U.S. regional combatant commanders they will have what they need to quickly respond in a crisis - anywhere, anytime. (U.S. Air Force photo/Airman 1st Class Clayton Cupit)