People take a picture at the World War II Normandy American Cemetery and Memorial situated above Omaha Beach, during the 77th anniversary of D-Day, in Colleville-sur-Mer, Normandy, France, June 6, 2021. REUTERS/Stephane Mahe

People look as a C-130 aircraft flies over the World War II Normandy American Cemetery and Memorial situated above Omaha Beach, during the 77th anniversary of D-Day, in Colleville-sur-Mer, Normandy, France, June 6, 2021. REUTERS/Stephane Mahe

People look as a C-130 aircraft flies over the World War II Normandy American Cemetery and Memorial situated above Omaha Beach, during the 77th anniversary of D-Day, in Colleville-sur-Mer, Normandy, France, June 6, 2021. REUTERS/Stephane Mahe

A U.S. flag is seen in front of a tombstone as people walk at the World War II Normandy American Cemetery and Memorial situated above Omaha Beach, during the 77th anniversary of D-Day, in Colleville-sur-Mer, Normandy, France, June 6, 2021. REUTERS/Stephane Mahe

U.S. and French flags are seen in front of a tombstone at the World War II Normandy American Cemetery and Memorial situated above Omaha Beach, during the 77th anniversary of D-Day, in Colleville-sur-Mer, Normandy, France, June 6, 2021. REUTERS/Stephane Mahe

People walk at the World War II Normandy American Cemetery and Memorial situated above Omaha Beach, during the 77th anniversary of D-Day, in Colleville-sur-Mer, Normandy, France, June 6, 2021. REUTERS/Stephane Mahe

People walk at the World War II Normandy American Cemetery and Memorial situated above Omaha Beach, during the 77th anniversary of D-Day, in Colleville-sur-Mer, Normandy, France, June 6, 2021. REUTERS/Stephane Mahe

People visit the new British Normandy Memorial at Ver-sur-Mer, after an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

A view of the new British Normandy Memorial at Ver-sur-Mer, before an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Lord Edward Llewellyn, British Ambassador to France, and France's Defence Minister Florence Parly attend the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

People visit the new British Normandy Memorial at Ver-sur-Mer, after an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

French soldiers stand on Juno Beach, near the new British Normandy Memorial at Ver-sur-Mer, after an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

People visit the new British Normandy Memorial at Ver-sur-Mer, after an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

People visit the new British Normandy Memorial at Ver-sur-Mer, before an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

A general view of the new British Normandy Memorial at Ver-sur-Mer, before an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

People visit the new British Normandy Memorial at Ver-sur-Mer, before an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

People visit the new British Normandy Memorial at Ver-sur-Mer, before an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Lord Edward Llewellyn, British Ambassador to France, speaks with veteran David Mylchreest, 97, after the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Veterans Charles Shay, 96, looks on after the official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

French Air Force Patrouille de France Team perform at the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool TPX IMAGES OF THE DAY

Britain's Prince Charles remotely on-screen attends the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

A person stands next to the new British Normandy Memorial at Ver-sur-Mer, before an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Lord Edward Llewellyn, British Ambassador to France, looks on during the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Lord Edward Llewellyn, British Ambassador to France, speaks during the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Veteran David Mylchreest, 97, looks on as he attends the official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Veteran David Mylchreest, 97, looks on as he attends the official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Veteran David Mylchreest, 97, poses next to the new British Normandy Memorial at Ver-sur-Mer before the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

French Defence minister Florence Parly, veteran Charles Shay, 96, and veteran David Mylchreest, 97, attend the official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool REFILE - CORRECTING SURNAME

French soldiers stand during the official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

French Defence minister, Florence Parly, Prefect of Calvados Philippe Court, Veterans Charles Shay, 96, David Mylchreest, 97, attend the official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool REFILE - CORRECTING SURNAME

A general view of the new British Normandy Memorial at Ver-sur-Mer, before an official opening ceremony on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

The piper Jerome Levannier plays before the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Veteran David Mulchreest, 97, poses next to the piper Jerome Levannier before the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool

Veteran David Mylchreest, 97, poses before the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool REFILE - CORRECTING SURNAME

Veteran David Mylchreest, 97, poses before the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool REFILE - CORRECTING SURNAME

Veteran David Mylchreest, 97, poses before the official opening ceremony of the British Normandy Memorial at Ver-sur-Mer, on the 77th anniversary of D-Day, France, June 6, 2021. REUTERS/Stephane Mahe/Pool REFILE - CORRECTING SURNAME

Canadian-born Eric Leboeuf, D-Day tour guide for the Gold Beach Company, poses in front of a 1943 Willys U.S. military Jeep during an interview with Reuters near a German battery in Longues-sur-Mer ahead of the 77th anniversary of D-Day in Normandy, France, June 3, 2021. Picture taken June 3, 2021. REUTERS/Lucien Libert

U.S. Veteran Carver McGriff arrives in Bayeux ahead of the 77th anniversary of D-Day in Normandy, France, June 3, 2021. Picture taken June 3, 2021. REUTERS/Lucien Libert

Rima Hebert, whose luxury 32-bedroom hotel has been closed since March 2020, poses during an interview with Reuters in Bayeux ahead of the 77th anniversary of D-Day in Normandy, France, June 3, 2021. Picture taken June 3, 2021. REUTERS/Lucien Libert

Canadian-born Eric Leboeuf, D-Day tour guide for the Gold Beach Company, drives a 1943 Willys U.S. military Jeep during an interview with Reuters in Longues-sur-Mer ahead of the 77th anniversary of D-Day in Normandy, France, June 3, 2021. Picture taken June 3, 2021. REUTERS/Lucien Libert

U.S. Veteran Carver McGriff arrives in Bayeux ahead of the 77th anniversary of D-Day in Normandy, France, June 3, 2021. Picture taken June 3, 2021. REUTERS/Lucien Libert

Rima Hebert, whose luxury 32-bedroom hotel has been closed since March 2020, welcomes U.S. Veteran Carver McGriff at her hotel in Bayeux ahead of the 77th anniversary of D-Day in Normandy, France, June 3, 2021. Picture taken June 3, 2021. REUTERS/Lucien Libert

Canadian-born Eric Leboeuf, D-Day tour guide for the Gold Beach Company, poses in front of a 1943 Willys U.S. military Jeep during an interview with Reuters near a German battery in Longues-sur-Mer ahead of the 77th anniversary of D-Day in Normandy, France, June 3, 2021. Picture taken June 3, 2021. REUTERS/Lucien Libert

An employee works near tombstones at the World War II Normandy American Cemetery in Colleville-sur-Mer ahead of the 77th anniversary of D-Day in Normandy, France, June 2, 2021. Picture taken June 2, 2021. REUTERS/Lucien Libert

An aerial view shows the Normandy coast near Arromanches-les-Bains ahead of the 77th anniversary of D-Day in Normandy, France, June 2, 2021. Picture taken June 2, 2021 with a drone. REUTERS/Lucien Libert

A French man honours a U.S. soldier at the World War II Normandy American Cemetery in Colleville-sur-Mer ahead of the 77th anniversary of D-Day in Normandy, France, June 2, 2021. Picture taken June 2, 2021. REUTERS/Lucien Libert

An aerial view shows the remains of Mulberry Harbour at Arromanches (Gold Beach) ahead of the 77th anniversary of D-Day in Normandy, France, June 2, 2021. Picture taken June 2, 2021 with a drone. REUTERS/Lucien Libert

Sylvain Kast, a freelance D-Day beaches tour guide, poses for Reuters at Omaha Beach in Colleville-sur-Mer ahead of the 77th anniversary of D-Day in Normandy, France, June 1, 2021. Picture taken June 1, 2021. REUTERS/Lucien Libert

D-Day souvenirs are seen inside a souvenir shop in Arromanches-les-Bains ahead of the 77th anniversary of D-Day in Normandy, France, June 1, 2021. Picture taken June 1, 2021. REUTERS/Lucien Libert

Sylvain Kast, a freelance D-Day beaches tour guide, poses for Reuters at Omaha Beach in Colleville-sur-Mer ahead of the 77th anniversary of D-Day in Normandy, France, June 1, 2021. Picture taken June 1, 2021. REUTERS/Lucien Libert

People are seen by a cenotaph war memorial in Whitley Bay on the 75th Anniversary of D-Day, Whitley Bay, Britain, June 6, 2020. REUTERS/Lee Smith

War memorials are seen in Whitley Bay on the 75th Anniversary of D-Day, Whitley Bay, Britain, June 6, 2020. REUTERS/Lee Smith

War memorials are seen in Whitley Bay on the 75th Anniversary of D-Day, Whitley Bay, Britain, June 6, 2020. REUTERS/Lee Smith

Canadian Prime Minister Justin Trudeau bids farewell to U.S. House Speaker Nancy Pelosi, and the President of the French National Assembly Richard Ferrand looks on, as they leave after an international D-Day commemoration ceremony on Juno Beach in Courseulles-sur-Mer, France June 6, 2019. Picture taken June 6, 2019. Fred Tanneau/Pool via REUTERS

U.S. House Speaker Nancy Pelosi, French Prime Minister Edouard Philippe, Canadian Prime Minister Justin Trudeau, and Britain's Defence Secretary Penny Mordaunt stand by wreaths of flowers during an international D-Day commemoration ceremony on Juno Beach in Courseulles-sur-Mer, France June 6, 2019. Fred Tanneau/Pool via REUTERS TPX IMAGES OF THE DAY

U.S. World War II veteran Carl Mann, from Indiana, is buried at Arlington National Cemetery on the 75th anniversary of the D-Day invasion in Arlington, Virginia U.S., June 6, 2019. Mr. Mann, who died at the age of 96, was among the Allied troops who stormed Omaha Beach in Nazi-occupied northern France during the invasion. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY

French Prime Minister Edouard Philippe, Foreign Affairs Minister Jean-Yves Le Drian, and President of the French National Assembly Richard Ferrand, leave after an international D-Day commemoration ceremony on Juno Beach in Courseulles-sur-Mer, France June 6, 2019. Fred Tanneau/Pool via REUTERS

Canadian Prime Minister Justin Trudeau and French Prime Minister Edouard Philippe are presented with wreaths of flowers during an international D-Day commemoration ceremony on Juno Beach in Courseulles-sur-Mer, France June 6, 2019. Fred Tanneau/Pool via REUTERS

French Prime Minister Edouard Philippe delivers a speech during an international D-Day commemoration ceremony on Juno Beach in Courseulles-sur-Mer, France June 6, 2019. Fred Tanneau/Pool via REUTERS

Canadian Prime Minister Justin Trudeau bids farewell to U.S. House Speaker Nancy Pelosi, as the President of the French National Assembly Richard Ferrand looks on, as they leave an international D-Day commemoration ceremony on Juno Beach in Courseulles-sur-Mer, France June 6, 2019. Fred Tanneau/Pool via REUTERS