Thomas Dean enlisted in the Australian Imperial Force (AIF) at the age of 14.5 years old in October 1915. He was killed in action at the age of 18 on August 27, 1917. Dean was commemorated along with 102,000 other soldiers who died during World War I. Anzac Day on April 25 and Remembrance Day on November 11 are occasions to honor Australian and New Zealand soldiers who fought in wars including Dean and those who died in World War I.