Execellent some very good pictures there.
I think the black crew member is wearing, what appears to me to look like, a USMC dress uniform hat. Possibly a souvenir from one of the raiders? OTOH I don't know what head gear stewards were issued if they were issued different to other ratings.
Another thing that interests me is what was status of black servicemen in the USN and USMC? I know that the USA and USAAF were segregated until 1948 IIRC but it would crazy to have all black and all white ships!