Source: Per post at 18th Battalion Facebook Group by David Archer.
Family Search: Private William Vast was born on 15 May 1895, in Hampshire, England, United Kingdom as the son of Albert Alexander Vast and Edith. He immigrated to St. John, New Brunswick, Canada in 1912 and lived in Alton, Hampshire, England, United Kingdom in 1911 and Brampton, Peel, Ontario, Canada in 1921. He registered for military service in 1916. In 1916, at the age of 21, his occupation is listed as labourer in Churchville, Brampton, Peel, Ontario, Canada. He died in 1977, at the age of 82, and was buried in Brampton Cemetery, Brampton, Peel, Ontario, Canada.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 