The Falcon 1 rocket was designed for transport by truck and barge at sea level. The first stage had various breathers, vents, and ports, but most of these were closed for the flight to Kwajalein. In this transport mode, the large liquid oxygen fuel tank had only a small opening, a one-quarter-inch fuel line that went through a desiccant so that no moisture got into the rocket. Following takeoff, as the C-17 ascended, the ambient pressure in the cargo bay dropped. This posed no problem for the Falcon 1, as it was designed to be pressurized relative to its surroundings, like during a launch.
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