A robot places composite fibers on the tank’s inner wall structure. Engineers at Boeing Research & Technology formed the composite cryogenic tank using automated fiber placement at the Boeing Developmental Center in Tukwila, Wash. This tank recently completed pressure tests at the Marshall Center. In the past, propellant tanks have been fabricated out of metals. The almost 8-foot-diameter (2.4 meter) composite tank tested at the Hydrogen Cold Flow Test Facility at NASA's Marshall Space Flight Center in Huntsville, Ala. is considered game changing because composite tanks may significantly reduce the cost and weight for launch vehicles and other space missions.