One of the items mentioned in the masters of the air podcast was all of the bomber crewmembers were officers. They know that largely was because they anticipated any downed airman would be treated better if captured.
Not sure of that. Pilot, Co-pilot, Navigator & Bombardier yes. I think the gunners were Sgts. Of course some of them were 18, 19 years old. My uncle was 23-24 when he flew combat and was a Lt.