 Operating out of the Fleet Sound School for 11 months, "Lapwing" aided in the perfection of air ASW technology.After a cruise to Recife, Brazil (May–August 1944), as a task force support unit, the seaplane tender returned Key West on 4 September and operated there for the rest of the war.Arriving Charleston, South Carolina, 5 October 1945, "Lapwing" decommissioned there 29 November 1945.