RCAF Station Sea Island began as a Second World War British Commonwealth Air Training Plan station. No. 8 Elementary Flying Training School (EFTS) began operation here on July 22, 1940. After the war the station was renamed RCAF Station Vancouver. 442 Squadron was re-activated as 442 "City of Vancouver" Auxiliary Fighter Squadron at Sea Island 15 April 1946, but was later re-designated an Auxiliary Transport Squadron. 123 Rescue Flight and 121 Composite Flight (KU) were also formed at Sea Island. On 1 December 1951, 442 Squadron was split in half to form 443 "City of New Westminster" Squadron.