She was assigned to the United Kingdom under lend-lease on 23 June; she was redesignated CVE-54 on 15 July; launched on 22 November; and delivered to the British on 18 February 1944.

From March to August 1945 she was part of the British Pacific Fleet attached to the 30th Aircraft Carrier Squadron.

Renamed HMS Reaper (D82), the carrier operated in the Royal Navy for the duration of World War II.

Authorized for disposal on 14 June, Winjah was struck from the Navy Registry on 8 July and sold to the Waterman Steamship Company of Mobile, Alabama, on 12 February 1947 as South Africa Star.

Just after World War II, Reaper was responsible for bringing from Cherbourg Harbour many examples of former German Luftwaffe aircraft captured by the American military's Operation Lusty over to North America, such as the sole examples of the Arado Ar 234 jet reconnaissance bomber, and the Heinkel He 219 night fighter, that exist in American aviation museums in the 21st century.