Russian soldiers write home while serving on the Eastern Front during World War I, circa 1915. (Photo by Hulton Archive/Getty Images)

Israeli soldiers get ready to launch the Skylark drone during a drill on January 16, 2012 near Bat Shlomo, Israel. (Photo by Uriel Sinai/Getty Images)

An Iraqi special forces soldier shot dead an Islamic State suicide bomber in Mosul, Iraq March 3, 2017. (Photo by Goran Tomasevic/Reuters)

Taliban soldiers ride bumper cars at an amusement park in Kabul, Afghanistan on September 13, 2021. (Photo by WANA via Reuters)

A U.S. Army B-24 Liberator Bomber is hailed by a ground crewman as it takes off over a line of shark- nosed fighter planes at an advanced base in China on a mission on October 10, 1943, to bomb Japanese installations. (Photo by AP Photo)

In this picture taken on October 28, 2017, former Japanese p*rn star Mana Izumi checks her new tattoo at a tattoo studio in Tsurugashima, Saitama prefecture. Tattoos still provoke deep-rooted suspicion in Japan as the country prepares to host the 2020 Tokyo Olympics. People with body ink are refused entry to public swimming pools, bathing spots, beaches and often gyms, while visible body art can be harmful to job prospects. (Photo by Behrouz Mehri/AFP Photo)

Members of Japanese idol group Kamen Joshi (Masked Girls) in attires featuring images or names of U.S. President-elect Donald Trump, pose for a photo after their concert at their theatre in Tokyo's Akihabara district, Japan, December 12, 2016. (Photo by Toru Hanai/Reuters)

Soldiers, including two recruits who have brought some chickens, at Victoria prepare to board the train for the battle front. (Photo by Hulton Archive/Getty Images)