My wife's uncle having completed his first tour had it seemed crewed up with his second pilot at 29 OTU. They then went to 1660 HCU where at least the rear gunner who had previously completed one tour joined the crew and they all proceeded to 467 Squadron. So in this case at least the gunner had crewed up at HCU.
Clarification - further checking reveals that the gunner in question was also at 29 OTU but in D Flight whereas my wife's uncle and the pilot were in A Flight. The gunner had not flown with our pilot whilst at 29 OTU but may well have known him.
HTH
Mike
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