Nathaniel Thomas Callow (SN 19007) was born in Ballarat and was only 18 years old and still living with his parents when he enlisted, with their consent, on 19th February 1917. The assistant veterinary surgeon was posted to the 1st Divisional Signal Company and, after a couple of months basic training with the 1st Depot Battalion in Broadmeadows, he was sent to the Signal School in Seymour for a further three month's training. He left Melbourne in August on board the Themistocles, bound for Glascow. He spent the next eight months in England attached to Engineer Training Depots (Signal Section) , seemingly with only the occasional minor run in with his superiors to relieve the boredom, until he was finally posted to France in June 1918 with the 5th Divisional Signal Company. From his record, his overseas service seems to have passed uneventfully. He remained in France for a number of months after the end of the war, eventually returning to Australia on board the Port Melbourne, disembarking in Melbourne on 20th August 1919.

His father Andrew and older brother Auburn also served in the AIF and are honoured with trees in the Avenue.

Lucas’s Staffs Appreciation of Brave Men, the original Avenue register, records his name as Nathaniel I. Callow.