Question: What is the phrase that is commonly used on the day which is observed on 25 April each year?

full_context: Document 1: ANZAC (acronym): The ANZAC acronym came from the Australian and New Zealand Army Corps, formed in Egypt prior to the Gallipoli Campaign during the First World War. The corps was the higher formation for all Australian and New Zealand soldiers. It then gave its name to ANZAC Cove, on the Gallipoli peninsula, and at first was only used to identify the men who took part in the Gallipoli landings, although it later came to mean "any Australian or New Zealand soldier of the First World War." Both the 'ANZAC' and the 'Anzac' versions of the acronym have been protected by the Commonwealth Government of Australia.
Document 2: Citizens' War Memorial: The Citizens' War Memorial (alternate: Soldiers' War Memorial) in Cathedral Square, Christchurch, is one of the two major memorials in the city to World War I. It is located immediately north of ChristChurch Cathedral. The annual Anzac Day service is held there. It is a Category I heritage structure registered with Heritage New Zealand.
Document 3: The Last of the Light Brigade: "The Last of the Light Brigade" is a poem written in 1890 by Rudyard Kipling echoing – thirty-six years after the event – Alfred Tennyson's famous poem "The Charge of the Light Brigade". Employing synecdoche, Kipling uses his poem to expose the terrible hardship faced in old age by veterans of the Crimean War, as exemplified by the cavalry men of the light brigade who charged at the Battle of Balaclava. It describes a visit by the last twenty survivors of the charge to Tennyson (then in his eightieth year) to reproach him gently for not writing a sequel about the way in which England was treating its old soldiers. Some sources treat the poem as an account of a real event, but other commentators class the destitute old soldiers as allegorical, with the visit invented by Kipling to draw attention to the poverty in which the real survivors were living, in the same way that he evoked Tommy Atkins in "The Absent Minded Beggar".
Document 4: Remembrance Day: Remembrance Day (sometimes known informally as Poppy Day) is a memorial day observed in Commonwealth of Nations member states since the end of the First World War to remember the members of their armed forces who have died in the line of duty. Following a tradition inaugurated by King George V in 1919, the day is also marked by war remembrances in many non-Commonwealth countries. Remembrance Day is observed on 11 November in most countries to recall the end of hostilities of World War I on that date in 1918. Hostilities formally ended "at the 11th hour of the 11th day of the 11th month", in accordance with the armistice signed by representatives of Germany and the Entente between 5:12 and 5:20 that morning. ("At the 11th hour" refers to the "passing" of the 11th hour, or 11:00 am.) The First World War officially ended with the signing of the Treaty of Versailles on 28 June 1919.
Document 5: Vimy Ridge Day: Vimy Ridge Day is a day to commemorate the deaths and casualties of members of the Canadian Corps during the First World War Battle of Vimy Ridge. The holiday has been observed annually since 2003. It is not considered a public holiday.
Document 6: Lest we forget (phrase): The phrase "Lest we forget" is commonly used in war remembrance services and commemorative occasions in English speaking countries, in particular Remembrance Day and ANZAC Day. Before the term was used in reference to soldiers and war, it was first used in a 1897 Christian poem written by Rudyard Kipling called "Recessional". The phrase occurs 8 times; and is repeated at the end of the first 4 stanzas in order to add particular emphasis regarding the dangers of failing to remember.
Document 7: The Ballad of East and West: "The Ballad of East and West" is a poem by Rudyard Kipling. It was first published in 1889, and has been much collected and anthologised since. Its first line is often quoted, sometimes to ascribe racism to Kipling, particularly in regard to the British Empire. Those who quote it thus often completely miss the third and fourth lines. The full refrain, with which the poem opens and closes, includes a contradiction of the opening line:
Document 8: Two-minute silence: In the United Kingdom and other countries within the Commonwealth, a two-minute silence is observed as part of Armistice Day to remember those who lost their lives in conflict. Held each year at 11.00am on 11 November, the silence coincides with the time in 1918 at which the First World War came to an end with the cessation of hostilities, and is generally observed at war memorials and in public places throughout the UK and Commonwealth. A two-minute silence is also observed on Remembrance Sunday, also at 11.00am.
Document 9: Memorial Tablet: "Memorial Tablet (Great War)" is a poem by Siegfried Sassoon, written in October 1918 and first published in his 1919 collection "Picture-Show". The original manuscript is held by Cambridge University Library. Sassoon had by this time been invalided out of the army and the war had only a month to run.
Document 10: Anzac Day: Anzac Day is a national day of remembrance in Australia and New Zealand that broadly commemorates all Australians and New Zealanders "who served and died in all wars, conflicts, and peacekeeping operations" and "the contribution and suffering of all those who have served". Observed on 25 April each year, Anzac Day was originally to honour the members of the Australian and New Zealand Army Corps (ANZAC) who fought at Gallipoli against the Ottoman Empire during World War I.
Document 11: Veterans Day: Veterans Day is an official United States public holiday, observed annually on November 11, that honors military veterans; that is, persons who served in the United States Armed Forces. It coincides with other holidays, including Armistice Day and Remembrance Day, celebrated in other countries that mark the anniversary of the end of World War I; major hostilities of World War I were formally ended at the 11th hour of the 11th day of the 11th month of 1918, when the Armistice with Germany went into effect. The United States previously observed Armistice Day. The U.S. holiday was renamed Veterans Day in 1954.
Document 12: 1896 in poetry: — closing lines of Rudyard Kipling's "If—", first published this year
Document 13: Shrine of Remembrance: The Shrine of Remembrance, located in Kings Domain on St Kilda Road, Melbourne, Australia was built as a memorial to the men and women of Victoria who served in World War I and is now a memorial to all Australians who have served in war. It is a site of annual observances of ANZAC Day (25 April) and Remembrance Day (11 November) and is one of the largest war memorials in Australia.
Document 14: Australian and New Zealand Army Corps: The Australian and New Zealand Army Corps (ANZAC) was a First World War army corps of the Mediterranean Expeditionary Force. It was formed in Egypt in December 1914, and operated during the Battle of Gallipoli. General William Birdwood commanded the corps, which comprised troops from the First Australian Imperial Force and 1st New Zealand Expeditionary Force. The corps disbanded in 1916, following the Allied evacuation of the Gallipoli peninsula and the formation of I ANZAC Corps and II ANZAC Corps. The Corps was reestablished, briefly, in the Second World War during the Battle of Greece in 1941.
Document 15: National War Memorial (South Australia): The National War Memorial is a monument on the north edge of the city centre of Adelaide, South Australia, commemorating those who served in the First World War. Opened in 1931, the memorial is located on the corner of North Terrace and Kintore Avenue, adjacent to the grounds of Government House. Memorial services are held at the site throughout the year, with major services on both Anzac Day (25 April) and Remembrance Day (11 November).
ground_truth: "Lest we forget"