Today, 25 April, is celebrated in Australia and New Zealand as ANZAC day. The word is an acronym for Australia New Zealand Army Corps, and remembers Australia's and New Zealand's war dead. The date was chosen for the day of the Gallipoli landings in the First World War. This was in 1915 before the US entered the war.
In Gallipoli Australia suffered over 8,000 casualties in the eight-month-long confrontation with the Turkish army under the command of Kemal Ataturk. Eventually, Australia along with the British and New Zealand forces withdrew, a victory for Turkey, and one of the pivotal historical points in the formation of Australia as a nation.
This year will be the 95th Anzac Day, with the occasion being proclaimed in 1916.
By the end of the war, about 1.38% of the Australian population was dead, and more than twice that many were wounded. The figures, proportionately, were even higher for New Zealand, and higher still for the UK (994,000 dead).
Despite its late entry, the US also suffered huge losses: over 100,000 dead, although obviously it was a much smaller proportion of its population.
As we say in Australia: Lest We Forget!