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Perhaps because each unit could only provide oxygen for a limited amount of time, at least two sets of units were used sequentially from the time that the crew started breathing pure oxygen in the suiting room until they were hooked up to spacecraft oxygen. Journal Contributor James Hill calls attention to the fact that, as can be seen in launch-day photo 69-H-1121, units with white hoses were in use as they boarded the transfer van for the trip to the pad and, as can be seen in launch-day photo KSC-69PC-399, by the time they were on the swing arm, they were using black-hose units... We do not currently know if there was a thermal reason for using two different units or if the units could provide oxygen for less than the hour that the crews typically used the POVs and the difference in the hoses was a means of keeping track of the units.
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