That's an 18" DOUBLE MOORING BITT he is sitting on.
USS Kawishiwi
AO-146
1957
The black, bag looking item is
Bob's Hammock. The nights got pretty hot down below.
I remember this location, vividly. While mooring in Philadelphia after
the 1st sea trial, I nearly got my foot caught in the line as it was
being paid out.

Photos by: Bob
Lewandowski.....SF 55-57crew