After a period of drydocking for repairs, she got underway on 16 April for a shakedown cruise to Bermuda and returned to Boston on 15 May for post-shakedown availability.

On 13 July, Alexander J. Luke sailed as a unit of Escort Division 66 in company with a convoy bound for Bizerte, Tunisia.

Following an availability period and training exercises at Boston and Casco Bay, Maine, Alexander J. Luke joined Task Group 62.7 for another voyage to the Mediterranean.

She got underway on 23 November for a period of anti-submarine warfare exercises and tactical maneuvers conducted at Casco Bay; NS Argentia, Newfoundland; Halifax, Nova Scotia; and New London, Connecticut.

She made port calls at Derry, Northern Ireland; Liverpool and Falmouth, England; and Loch Alsh, Scotland.

Having completed this mission, she reported to the Brown Shipbuilding Corp., Houston, Texas, on 22 June for conversion to a radar picket escort ship.

She continued her routine of anti-submarine warfare exercises and tactical maneuvers held along the East Coast through 18 October 1947.