Death registrations for World War I casualties are not available at the BC Archives. See the World War I Canadian Dead section of the Canada at War website for a searchable listing of over 63,000 names with the date and location of death, if known. (There is also a section for World War II Canadian Dead.)
Death registrations for 3,423 BC World War II casualties (1940-1945) were collected by the Division of Vital Statistics at the time, although they were kept separately from the provincial death registrations and not included in the indexes. They are now included in the deaths index in both the old genealogy search and the new genealogy database. Images for these records will soon be loaded on the latter and are also available on microfilm.
The records consist of completed statements documenting the deaths of members of the armed forces who died while on active duty and who were residents of BC. During the war, the armed forces completed forms supplied by the province to register the deaths. The statements contain personal particulars and the date, place, and cause of death. The forms also contain medical certificates of death, although these were not always completed by a physician.
You can search the overseas casualties by names of individuals, by using a partial match in the place field for the country for people killed in action on land (most common are England, Holland, Hong Kong, India, Italy, France, and Germany), by using the terms "overseas" or "at sea" in the place field, or by browsing reels of film, if special difficulties are encountered (B14424, B14425, B14426, and B14427).