On 9 July 1945
Calcaterra headed for the Pacific to tackle a new job, but the war ended shortly before her arrival at
Pearl Harbor. She lifted passengers back to the west coast, then sailed on to the Atlantic.
Calcaterra was placed out of commission in reserve at
Green Cove Springs, Florida, on 1 May 1946. Reclassified DER-390 on 28 October 1954,
Calcaterra was converted to a
radar picket ship at
Norfolk, Virginia, and recommissioned on 12 September 1955. Based on
Newport, Rhode Island, the radar picket ship almost continuously served in the violent weather of the North Atlantic once lost all life lines and ready service box's, 5" gun mount was lifted of her gimbals that a crane had to be used to remount it, to maintain her link in the extension of the
Distant Early Warning system. Except for exercises with the fleet in the Atlantic and
Caribbean, and a cruise to Europe,
Calcaterra continued this duty through 1960. ==Final decommissioning==