People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

A man waits for the Veteran's Day Parade to begin in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

Mary Jane McWilliams from Frederick, Maryland, visits her son's grave on Veterans Day, at Arlington National Cemetery in Washington, U.S., November 11, 2021. REUTERS/Evelyn Hockstein REFILE - CORRECTING SPELLING OF CITY 

Mary Jane McWilliams from Frederick, Maryland, visits her son's grave on Veterans Day, at Arlington National Cemetery in Washington, U.S., November 11, 2021. REUTERS/Evelyn Hockstein REFILE - CORRECTING SPELLING OF CITY 

Jorge Garcia and daughter Cadhla take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri TPX IMAGES OF THE DAY 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

Mary Jane McWilliams from Frederick, Maryland, visits her son's grave on Veterans Day, at Arlington National Cemetery in Washington, U.S., November 11, 2021. REUTERS/Evelyn Hockstein REFILE - CORRECTING SPELLING OF CITY 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

People take part in the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

A woman carries flowers on Veterans Day through Section 60 of Arlington National Cemetery in Washington, U.S., November 11, 2021. REUTERS/Evelyn Hockstein 

Lynn and John Santoriello from Pittsburgh visit the grave of their nephew who was killed in Iraq on Veterans Day at Arlington National Cemetery in Washington, U.S., November 11, 2021. REUTERS/Evelyn Hockstein 

Lynn and John Santoriello from Pittsburgh visit the grave of their nephew who was killed in Iraq on Veterans Day at Arlington National Cemetery in Washington, U.S., November 11, 2021. REUTERS/Evelyn Hockstein 

World War II Army veteran Arnold Strauch, 96, holds his hand over his heart during a ceremony at the beginning of the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

World War II Army veteran Arnold Strauch, 96, holds his hand over his heart during a ceremony at the beginning of the Veteran's Day Parade in the Manhattan borough of New York City, New York, U.S., November 11, 2021. REUTERS/Carlo Allegri 

Canada's Prime Minister Justin Trudeau speaks with a veteran during a ceremony at the National War Memorial on Remembrance Day in Ottawa, Ontario, Canada November 11, 2021. REUTERS/Patrick Doyle 

Canada's Prime Minister Justin Trudeau talks with a veteran during a ceremony at the National War Memorial on Remembrance Day in Ottawa, Ontario, Canada November 11, 2021. REUTERS/Patrick Doyle 

U.S. President Joe Biden speaks at the Memorial Amphitheater, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden speaks at the Memorial Amphitheater, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden speaks at the Memorial Amphitheater, in Arlington National Cemetery, on Veterans Day, in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden speaks at the Memorial Amphitheater, in Arlington National Cemetery, on Veterans Day, in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

A wreath placed by U.S. President Joe Biden rests in front of the Tomb of the Unknown Soldier after a centennial ceremony, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden speaks at the Memorial Amphitheater, in Arlington National Cemetery, on Veterans Day, in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden speaks in the the Memorial Amphitheater, in Arlington National Cemetery, on Veterans Day, Thursday in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden places a wreath during a centennial ceremony for the Tomb of the Unknown Soldier, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden pauses after placing a wreath during a centennial ceremony for the Tomb of the Unknown Soldier, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden salutes after placing a wreath during a centennial ceremony for the Tomb of the Unknown Soldier, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden salutes after placing a wreath during a centennial ceremony for the Tomb of the Unknown Soldier, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

Children wearing protective face masks stand holding signs during a Veterans Day ceremony at the John Philip Sousa Memorial Bandshell at Sunset Park in Port Washington, New York, U.S. November 11, 2021. REUTERS/Shannon Stapleton 

A child kisses a man during a Veterans Day ceremony at the John Philip Sousa Memorial Bandshell at Sunset Park in Port Washington, New York, U.S., November 11, 2021. REUTERS/Shannon Stapleton 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

A boy stands with a U.S. flag made of paper during a Veterans Day ceremony at the John Philip Sousa Memorial Bandshell at Sunset Park in Port Washington, New York, U.S., November 11, 2021. REUTERS/Shannon Stapleton 

A U.S. military veteran stands with a flag during a Veterans Day ceremony at the John Philip Sousa Memorial Bandshell at Sunset Park in Port Washington, New York, U.S., November 11, 2021. REUTERS/Shannon Stapleton 

U.S. military veterans sit during a Veterans Day ceremony at the John Philip Sousa Memorial Bandshell at Sunset Park in Port Washington, New York, U.S. November 11, 2021. REUTERS/Shannon Stapleton 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. military veterans stand as they salute during a Veterans Day ceremony at the John Philip Sousa Memorial Bandshell at Sunset Park in Port Washington, New York, U.S., November 11, 2021. REUTERS/Shannon Stapleton 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

Participants attend a ceremony to mark Veterans Day and the centennial anniversary of the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden attends a ceremony to mark Veterans Day and the centennial anniversary of the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

A formation of U.S. Navy F/A-18 Hornets fly over during a centennial ceremony for the Tomb of the Unknown Soldier, in Arlington National Cemetery, on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Alex Brandon/Pool via REUTERS 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

A joint service flyover honoring the centennial anniversary of the Tomb of the Unknown Soldier takes place at Arlington National Cemetery on Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Kenny Holston /Pool via REUTERS 

A U.S. Army Soldier looks out across Arlington National Cemetery prior to the start of a full honors procession honoring the centennial anniversary of the Tomb of the Unknown Soldier Veterans Day in Arlington, Virginia, U.S. November 11, 2021. Kenny Holston /Pool via REUTERS 

U.S. President Joe Biden is accompanied by Secretary of Veterans Affairs Denis McDonough and Alan D. Paley, National Commander at Jewish War Veterans of the United States of America, during a ceremony to mark Veterans Day and the centennial anniversary of the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden attends a ceremony to mark Veterans Day and the centennial anniversary of the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden is accompanied by Secretary of Veterans Affairs Denis McDonough and Alan D. Paley, National Commander at Jewish War Veterans of the United States of America, during a ceremony to mark Veterans Day and the centennial anniversary of the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden delivers remarks at the National Veterans Day Observance at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis 

U.S. President Joe Biden is accompanied by Secretary of Veterans Affairs Denis McDonough and Alan D. Paley, National Commander at Jewish War Veterans of the United States of America, during a ceremony to mark Veterans Day and the centennial anniversary of the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia, U.S., November 11, 2021. REUTERS/Leah Millis