Civilian contractors detach CH-47 helicopters from the hull of a commercial cargo ship at the TC dock Oct. 14, 2010, on Joint Base Charleston-Weapons Station, S.C. Contractors off-loaded eight CH-47 helicopters in just under two hours to be inspected and reassembled with blades and other parts for transportation. (U.S. Air Force photo/Senior Airman Timothy Taylor)

Civilian contractors spot for a driver as he tows a CH-47 helicopter to a temporary storage lot at the TC dock Oct. 14, 2010, on Joint Base Charleston-Weapons Station, S.C. The CH-47 Chinook's primary roles are troop movement, artillery emplacement and battlefield resupply and can travel at speeds above 155 miles per hour. (U.S. Air Force photo/Senior Airman Timothy Taylor)

Chief Warrant Officer 2 Glen Simpson watches over a CH-47 and it's crew as it's off-loaded at the TC dock, Oct. 14, 2010, on Joint Base Charleston Weapons Station, S.C. The average travel time from over-seas to the U.S. for most cargo vessels is three weeks but can vary depending on weather and location of ports. CW2 Simpson is the mobility warrant officer and operations chief with the Army's 841st Transportation Battalion. (U.S. Air Force photo/Senior Airman Timothy Taylor)

A civilian contractor signals for spotters to move the CH-47 forward down the off-ramp at the TC dock Oct. 14, 2010, on Joint Base Charleston-Weapons Station, S.C. Different cargo vessels have smaller or larger storage capacities and require different lengths of time for off-loading. Some of the larger vessels arrive at the docks with more than 1,900 pieces of equipment and can take more than two weeks to off-load. (U.S. Air Force photo/Senior Airman Timothy Taylor)

A civilian contractor signals for spotters to move the CH-47 forward down the off-ramp at the TC dock Oct. 14, 2010, on Joint Base Charleston Weapons Station, S.C. The TC dock is open to cargo vessels dock around the clock but only off-loads and on-loads cargo during a 12-hour window. (U.S. Air Force photo/Senior Airman Timothy Taylor)

CH-47 Helicopters sit on a temporary storage lot until contractors can inspect and reassembled them for further transport at the TC dock Oct. 14, 2010, on Joint Base Charleston Weapons Station, S.C. The CH-47 Chinook is a twin-engine, tandem rotor heavy-lift helicopter that was designed by Boeing Vertol in the early 1960s. (U.S. Air Force photo/Senior Airman Timothy Taylor)