This photograph taken by Frank Wolfe on May 4, 1990, depicts a celebration held at the Lyndon B. Johnson Library Auditorium in Austin, Texas, for the 25th anniversary of the inauguration of President Lyndon B. Johnson. Pictured here from left to right: Lynda Bird Johnson Robb, former First Lady Lady Bird Johnson, and Luci Baines Johnson.

In this photograph, President George H. W. Bush participates in a ceremonial wreath laying at the Tomb of the Unknown Soldier in Arlington National Cemetery on Veterans Day 1991. Since 1921, presidents have paid their respects at the Tomb of the Unknown Soldier, often in observance of military commemorations including Veterans Day and Memorial Day.

In this photograph, President Ronald Reagan participates in a ceremonial wreath laying at the Tomb of the Unknown Soldier in Arlington National Cemetery on Veterans Day 1985. Since 1921, presidents have paid their respects at the Tomb of the Unknown Soldier, often in observance of military commemorations including Veterans Day and Memorial Day.

In this photograph, taken in 1927, President Calvin Coolidge observes Armistice Day, which preceded the formal holiday of Veterans Day, by laying a wreath at the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia. Since 1921, presidents have paid their respects at the Tomb of the Unknown Soldier, often in observance of military commemorations including Veterans Day and Memorial Day.

In this photograph, taken by David Bohrer on September 18, 2001, President George W. Bush and Vice President Richard B. Cheney join White House staff to observe a moment of silence on the South Lawn honoring the victims of the terrorist attacks on September 11, 2001. The moment of silence ceremony has remained a tradition in the formal observation of September 11th at the White House. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service.

In this photograph, taken by Paul Morse on September 18, 2001, President George W. Bush and Vice President Richard B. Cheney join White House staff to observe a moment of silence on the South Lawn honoring the victims of the terrorist attacks on September 11, 2001. The moment of silence ceremony has remained a tradition in the formal observation of September 11th at the White House. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service.

In this photograph, taken by Kimberlee Hewitt on September 10, 2006, President George W. Bush and First Lady Laura Welch Bush participate in a wreath-laying ceremony at the north reflecting pool at the former site of the World Trade Center in New York, New York. President and Mrs. Bush paid their respects at the site to commemorate the fifth anniversary of the terrorist attacks that destroyed the twin towers of the World Trade Center on September 11, 2001. The National September 11 Memorial was later built on the site and dedicated on September 11, 2011. In May 2014, an adjacent museum was opened and dedicated by President Barack Obama.

In this photograph, President George W. Bush delivers a speech during the dedication ceremony for the National 9/11 Pentagon Memorial in Arlington, Virginia on the seventh anniversary of the terrorist attacks against the United States on September 11, 2001. Former Secretary of Defense Donald Rumsfeld can be seen seated behind the president. Designed by Julie Beckman and Keith Kaseman, the memorial honors the 184 victims who perished when the hijacked aircraft American Airlines Flight 77 crashed into the west side of the Pentagon. The outdoor memorial identifies victims by name and age, and includes illuminated water features to represent each victim. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President George W. Bush, First Lady Laura Welch Bush, Vice President Richard B. Cheney, and Second Lady Lynne V. Cheney join White House staff for a moment of silence on the South Lawn in commemoration of the fourth anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President George W. Bush, First Lady Laura Welch Bush, Vice President Richard B. Cheney, and Second Lady Lynne V. Cheney join White House staff for a moment of silence on the South Lawn in commemoration of the second anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President George W. Bush, First Lady Laura Welch Bush, Vice President Richard B. Cheney, and Second Lady Lynne V. Cheney join victims' families for a moment of silence on the South Lawn in commemoration of the third anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President George W. Bush and First Lady Laura Welch Bush participate in a wreath-laying ceremony near the crash site for United Airlines Flight 93 in Somerset County, Pennsylvania, on the first anniversary of the terrorist attacks against the United States on September 11, 2001. Flight 93 was one of four airplanes hijacked by al-Qaida terrorists on September 11, 2001. Believed to be targeting the United States Capitol Building, the flight crashed into a field after passengers and crew attempted to regain control of the aircraft. Preliminary work for the Flight 93 National Memorial was completed on September 10, 2010, and the permanent memorial opened to the public on September 10, 2015. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, taken by Eric Draper on September 11, 2002, President George W. Bush and First Lady Laura Welch Bush light a candle at St. John's Episcopal Church in Washington, D.C., during a private service of prayer and remembrance honoring the victims of the terrorist attacks on September 11, 2001. This first anniversary of the attacks was also the first observation of Patriot Day, a day designated by President Bush for national participation in remembrance ceremonies. On September 11, 2002, President Bush also participated in a moment of silence at the White House and visited the location of the terrorist attacks in Somerset County, Pennsylvania, the former site of the World Trade Center in New York city, and the Pentagon in Arlington, Virginia.

This photograph shows a bugler from the United States Marine Band performing taps during a moment of silence ceremony on the South Lawn of the White House in observance of the 19th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

This photograph shows a moment of silence ceremony held on the South Lawn of the White House in observance of the 19th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

This photograph shows a moment of silence ceremony held on the South Lawn of the White House in observance of the 19th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

This photograph, taken by Joyce N. Boghosian on September 11, 2020, shows the American flag atop the White House flown at half-staff in observance of Patriot Day. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

This photograph, taken by Joyce N. Boghosian on September 11, 2020, shows the American flag atop the White House flown at half-staff in observance of Patriot Day. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, taken by Andrea Hanks on September 11, 2019, President Donald Trump and First Lady Melania Trump observe a moment of silence during the September 11th Observance Ceremony at the Pentagon in Arlington, Virginia. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, taken by Andrea Hanks on September 11, 2019, President Donald Trump and First Lady Melania Trump participate in a wreath-laying ceremony with Secretary of Defense Mark Esper, his wife Leah Esper, the Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford and his wife Ellyn Dunford during the September 11th Observance Ceremony at the Pentagon in Arlington, Virginia. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President Donald Trump and First Lady Melania Trump join White House staff for a moment of silence on the South Lawn in commemoration of the 18th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President Donald Trump and First Lady Melania Trump depart from the South Lawn following a moment of silence with White House staff in commemoration of the 18th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President Donald Trump and First Lady Melania Trump depart from the South Lawn following a moment of silence with White House staff in commemoration of the 18th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President Donald Trump and First Lady Melania Trump depart through the doors of the Diplomatic Reception Room to join White House staff on the South Lawn to observe a moment of silence in commemoration of the 18th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, a flag detail and a lone bugler from the United States Marine Band march across the South Grounds in front of the Rose Garden in advance of a moment of silence held on the South Lawn to commemorate the 18th anniversary of the terrorist attacks against the United States on September 11, 2001. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.