After workups, Kamsack initially joined Sydney Force. However, in December 1941, she began her service with the Newfoundland Escort Force as part of escort group N13. In April 1942, Kamsack joined the Mid-Ocean Escort Force (MOEF) for two months as a part of escort group C-3. In June 1942, she transferred to the Western Local Escort Force (WLEF), with whom Kamsack would spend the rest of the war with. As a member of WLEF, in June 1943 she was assigned to escort group W-4 and in April 1944, group W-3.
