The decompressions were to 56k ft for partial pressure jerkin and g suits and 60 k ft plus a Taylor helmet. Without the helmet it was uncomfortable breathing against the oxygen pressure whereas with the helmet it was easy. For the lower 'bang' there was a doc with you. For the higher 'bang' you were left alone in the chamber with a doc outside. I remember the chamber misting up after the 60 k decompression and, after some seconds, seeing the doc looking in anxiously hoping to see a thumbs up otherwise he had to come in after you. We always flew with the pressure jerkin as there were not enough SARAH/SARBE (can't remember which) to out fit both a jerkin and a Mae West each. So the Boss wanted us to wear the jerkin in case we had to go high alt. Difficult at first but we got used to it.