A boy shoots a World War II machine gun armed with blanks at an weapon exhibition during a military show near Kirovsk, about 30 kilometers (19 miles) east of St. Petersburg, Russia, Sunday, January 21, 2018. (Photo by Dmitri Lovetsky/AP Photo)

A visitor tries out Lenovo augmented reality glasses with the Star Wars Jedi Challenges during the Mobile World Congress in Barcelona, Spain, February 26, 2018. The Mobile World Congress, the world' s biggest mobile fair, is held in Barcelona from February 26 to March 1. (Photo by Yves Herman/Reuters)

An OV-10 Bronco aircraft, decorated with World War One commemoration motifs, flies over Flanders international airport, ahead of the world's first Short Take Off & Landing competition on sand, in Wevelgem, Belgium May 8, 2018. (Photo by Francois Lenoir/Reuters)

The singing group The D-Day Darlings take part in the unveiling ceremony of a permanent war memorial, created by artist and writer Fabian Peake, at St Pancras International railway station in London, Britain, November 8, 2018. (Photo by Peter Nicholls/Reuters)

Israeli soldiers cry during a state memorial ceremony marking two years since the 2014 Gaza war “Operation Protective Edge” at Mount Herzl military cemetery in in Jerusalem, Israel, 26 July 2016. More than 2.000 people were killed in the conflicts between Israel and Palestine. (Photo by Abir Sultan/EPA)

A participant in the Borodino Battle re-enactment before the show at the Borodino Field in the Moscow Region on September 4, 2016. The Battle of Borodino, fought on September 7, 1812, was a battle fought in the Napoleonic Wars during the French invasion of Russia. The fighting involved around 250,000 troops and left at least 70,000 casualties, making Borodino the deadliest day of the Napoleonic Wars. (Photo by Kirill Kallinikov/Sputnik)

June 21: “World War Z”. Brad Pitt battles zombie apocalypse in $170 million film by “Quantum of Solace” director Marc Forster. This publicity photo released by Paramount Pictures shows, center, Brad Pitt as Gerald Lane in a scene from the film, “World War Z”, from Paramount Pictures and Skydance Productions in association with Hemisphere Media Capital and GK Films. (Photo by Jaap Buitendijk/AP Photo/Paramount Pictures)

Crowds look on as Xolo the Giant Dog, one of the giant Royal De Luxe street puppets taking part in Liverpool's World War I centenary commemorations, walks through the streets of Liverpool on July 25, 2014 in Liverpool, England. French street theatre company Royal de Luxe are putting on a show throughout the city as part of Liverpool's World War I centenary commemorations from July 23-27. The giant puppet grandmother has slept in the hall for two days as part of “Memories of August 1914”. As the giants tour the city the Little Girl Giant and her dog Xolo will meet up with the giant Grandmother telling the story of life leading up to World War One. (Photo by Christopher Furlong/Getty Images)