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The PRAXAIR liquid hydrogen (LH2) truck arrives at the liquid hydrogen 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 review procedures and prepare for a fit check of the new LH2 transfer flex hose. PRAXAIR will connect the transfer flex hose from its 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