Walter Arthur Waller (SN 503) was born in Ballarat and attended the Urquhart Street State School. He enlisted in Melbourne on August 19th, 1914. Single, 20 years old, and employed as a labourer, he joined the 4th Light Horse Regiment and embarked from Melbourne in October on board the Wiltshire. He was seriously wounded at Gallipoli in July and evacuated to hospital in Egypt. Once recovered he transferred to the Anzac Police, part of the Australian Provost Corps, and was promoted Lance Corporal. He was attached to 1st Light Horse Regiment and on January 10th 1917 he died of wounds sustained during action at Village Sheik Yowail. He has no known grave and is listed on the Jerusalem Memorial in Israel.

His twin brother John was killed at Gallipoli in April 1915 and his older brother George also served in the AIF. Both brothers are honoured with trees in the Avenue.