Yom Hazikaron (Hebrew: יוֹם הַזִּכָּרוֹן; lit. "Memorial Day"), in full Yom Hazikaron l'Chalalei Ma'arachot Yisrael ul'Nifge'ei Pe'ulot Ha'eivah (Hebrew:יוֹם הזִּכָּרוֹן לַחֲלָלֵי מַעֲרָכוֹת יִשְׂרָאֵל וּלְנִפְגְעֵי פְּעוּלוֹת הָאֵיבָה; lit. "Memorial Day for the Fallen Soldiers of Israel and Victims of Terrorism"), is Israel's official remembrance day, enacted into law in 1963. While Yom Hazikaron has been traditionally dedicated to fallen soldiers, commemoration has also been extended to civilian victims of terrorism.
In 1949 and 1950, the first two years after the declaration of the State, memorial services for soldiers who fell in the War of Independence were held on Independence Day. Services at military cemeteries were coordinated between the IDF and the Ministry of Defense. A concern arose, expressed by families of fallen soldiers, to establish a separate memorial day observance distinct from the festive celebrations of national independence. In response, and in light of public debate on the issue, Prime Minister David Ben-Gurion – also serving as Minister of Defense – established in January 1951 the "Public Council for Soldiers' Commemoration". This council recommended establishing the 4th of Iyyar, the day preceding Independence Day, as the "General Memorial Day for the Heroes of the War of Independence". This proposal won government approval that same year.
Yom Hazikaron is the national remembrance day observed in Israel for all Israeli military personnel who lost their lives in the struggle that led to the establishment of the State of Israel and for those who have been killed subsequently while on active duty in Israel’s armed forces. As of Yom Hazikaron in 2017 that number was 23,544.
By law, all places of entertainment are closed on the eve of Yom Hazikaron, and broadcasting and educational bodies note the solemnity of the day. Regular television programs cease for the day, and the names and ranks of every soldier who died for Israel are displayed in a 24-hour television broadcast.
Memorial candles are lit in homes, army camps, schools, synagogues, and public places, and the flags are lowered to half staff. Throughout the day serving and retired military personnel serve as honor guards at war memorials throughout the country, and the families of the fallen participate in memorial ceremonies at military cemeteries.
National memorial services are held in the presence of Israel's top leadership and military personnel. The day opens with a siren the preceding evening at 20:00 (8:00 pm), given that in the Hebrew calendar system, a day begins at sunset. The siren is heard all over the country and lasts for one minute, during which Israelis stop everything, including driving on highways, and stand in silence, commemorating the fallen and showing respect.
Many traditional and religious Jews say prayers for the souls of the fallen soldiers on Yom Hazikaron. Special prayers prescribed by the Israeli rabbinate are recited. These include the recital of Psalms 9: "For the leader, on the death of the son," and Psalm 144: "Blessed be the Lord, My Rock, who traineth my hands for war and my fingers for battle" in addition to memorial prayers for the dead. The official ceremony to mark the opening of the day takes place at the Western Wall,.
A two-minute siren is sounded at 11:00 the following morning, which marks the opening of the official memorial ceremonies and private remembrance gatherings at each cemetery where soldiers are buried. Many Israelis visit the resting places of loved ones throughout the day. The day officially draws to a close at sundown (between 19:00 and 20:00; 7–8 p.m.) in a ceremony at the national military cemetery on Mount Herzl, marking the start of Israel Independence Day, when the flag of Israel is returned to full staff.
Channel 33 has screened the names of all civilians killed in pogroms since 1851, and all fallen from 1860 (considered the date of the beginning of the Yishuv by the Israeli Ministry of Defense), in chronological order (rank, name, Hebrew date deceased and secular date) over the course of the day.  This has been mentioned in the West Wing episode "Memorial Day"; However, it is unknown whether or not this will continue following the replacement of the Israeli Broadcasting Authority by the Israeli Public Broadcasting Corporation.
Scheduling Yom Hazikaron right before Yom Ha-Atzma'ut is intended to remind people of the price paid for independence and of what was achieved with the soldiers' sacrifice. This transition shows the importance of this day among Israelis, most of whom have served in the armed forces or have a connection with people who were killed during their military service.
To avoid the possibility of Sabbath desecration should either Yom Hazikaron or Yom Ha'atzma'ut take place on Saturday night, both are observed one or two days earlier (the 3rd and 4th, or the 2nd and 3rd, of Iyar) when the 5th of Iyar falls on a Friday or Saturday (Shabbat). Likewise, when Yom Hazikaron falls on Saturday night/Sunday day, both observances are rescheduled to one day later.
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...culminating with a torch-lighting ceremony on Mount Herzl at 8 p.m., which ushers in Yom Ha'atzmaut
...the practice of commemorating the fallen on this day started in 1951 to mark the connection between Independence Day and the people who died to achieve and maintain this independence.