The 5.5-meter tank currently is being manufactured at the Boeing Developmental Center in Tukwila, Wash. It will be one of the largest composite propellant tanks ever made and is scheduled to be pressure-tested in 2014 at NASA's Marshall Space Flight Center in Huntsville, Ala. John Vickers, the cryogenic tank project manager at Marshall said "The 18-foot (5.5-meter) tank will be one of the largest composite propellant tanks ever built and will incorporate design features and manufacturing processes applicable to a 27.5-foot (8.4-meter) tank, the size of metal tanks found in today's large launch vehicles."