The 17th Battalion was an infantry battalion of the Australian Army. Although its numerical designation was bestowed upon it during World War I, the 17th Battalion can trace its lineage back to 1860, when a unit of the New South Wales Volunteer Rifles was raised in St Leonards, New South Wales. This unit has since been disbanded and reformed a number times. Through its links with the units of the colonial New South Wales defence force, the battalion's history includes service in the Sudan and South Africa. During World War I, the 17th Battalion was raised for overseas service as part of the Australian Imperial Force. Attached to the 5th Brigade, 2nd Division, the battalion was raised in 1915 and sent to Egypt initially, before taking part in the fighting at Gallipoli against the Turks. Later the battalion was sent to the Western Front in France and Belgium, where it served in the trenches as part of the Australian Corps. Throughout the course of the war, the battalion won numerous battle honours and its members received many individual awards, however, at the end of the war the battalion was disbanded in April 1919.

5th Brigade is a brigade of the Australian Army. Originally raised as a militia formation in 1912, the 5th Brigade was re-raised for overseas service in 1915 as part of the Australian Imperial Force during the First World War. The brigade then served during the Gallipoli Campaign and on the Western Front. During the inter-war years, it was re-raised as a part-time formation as part of Citizens Military Force. It undertook garrison duties in Australia during the Second World War, but was not deployed overseas before being disbanded in 1944. Following the war, the brigade was re-raised in 1948 once again and it is currently a Reserve combined arms formation based in New South Wales and forms part of the 2nd Division.