The 2/3rd Battalion was an infantry battalion of the Australian Army. Raised for service during the Second World War as part of the Second Australian Imperial Force, it was formed in October 1939 in Sydney and was attached to the 16th Brigade, 6th Division, the first formation raised as part of the 2nd AIF during the war. Deploying to the Middle East in early 1940, it saw action in North Africa, Greece, Crete, and Syria in 1941–1942 before returning to Australia following Japan's entry into the war, and was one of only two Australian infantry battalions to fight against all the major Axis powers of the war: the Germans, Italians, Japanese and Vichy French.

The 16th Brigade was an infantry brigade in the Australian Army. First raised in 1912 as a Militia formation to provide training under the compulsory training scheme, the brigade was later re-raised as part of the First Australian Imperial Force during World War I. Its existence was short-lived, as it was disbanded after about six months, before it could be committed to the fighting on the Western Front. Raised again in 1939 for service during World War II, the brigade was deployed to the Middle East in early 1940 and subsequently saw action in the Western Desert and in Greece in 1941. In 1942, it returned to Australia in response to Japan's entry into the war, and later the brigade played a prominent role in the Kokoda Track campaign and at Buna–Gona in Papua. Withdrawn to Australia in early 1943, the 16th Brigade was re-organised and received many replacements from disbanding formations, but it was not recommitted to combat operations until late in the war. In 1944–1945, the brigade was committed to the Aitape–Wewak campaign in New Guinea. After the war, the brigade was disbanded in 1946. Today, its name is perpetuated by the 16th Aviation Brigade which was raised on 2 April 2002.