Reindeer accompanied Husky and Lynx to Quebec City for conversion and arming in the summer of 1940. She was commissioned at Halifax on July 25 for service with Sydney Force, returning to Halifax on December 26 for the winter. She joined Gaspé Force in July 1941, but by year's end was back again with Halifax Local Defence Force. In May, 1942, she moved to Sydney Force, and that November, to Saint John, N.B. Force. On December 24, 1942, Reindeer was assigned as training ship to HMCS Cornwallis, then located at Halifax, transferring with the establishment to Digby in 1943. She was employed there on A/S training with RN submarines until the end of the war, except for a stint at Saint John, N.B., during the first half of 1944. She was paid off to reserve at Sydney on July 20, 1945, and sold later that year.
Formerly the Mascotte.