A 5″/38 Mark 21 pedestal mounting without the characteristic armored shield of the Mark 30s, was pointed over her stern. The Mark 21, in almost all uses, was disliked as it didn’t have a dedicated shell hoist, was manually trained, and elevated, and had a lower rate of fire. In most images of the Oyster Bays, they are shown cased. Also, note the stern depth charge racks. 19-N-54735.