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A fit check of the PRAXAIR liquid hydrogen (LH2) flex hose is underway at the LH2 tank at Launch Pad 39B at NASA’s Kennedy Space Center in Florida. PRAXAIR and engineers and technicians on the Test and Operations Support contract will connect the transfer flex hose from the LH2 truck to the LH2 tanker to confirm that the hose fits and functions properly. The Ground Systems Development and Operations Program is overseeing upgrades and modifications to Pad 39B to support processing of the Space Launch System rocket and Orion spacecraft for Exploration Mission 1 and NASA’s journey to Mars.