A serviceman of the 148th Separate Artillery Zhytomyr Brigade of the Armed Forces of Ukraine sits near shells as he and a soldier await command to fire a M777 Howitzer towards Russian troops at a position in a front line, amid Russia's attack on Ukraine, in Donetsk region, Ukraine, on February 8, 2025. (Photo by Anatolii Stepanov/Reuters)

Natalia, 51, a mother of three, serving as a combat medic in the 24th Mechanized Brigade takes part in a field training exercise in an undisclosed location in the eastern region of Ukraine, on March 18, 2025, amid the Russian invasion of Ukraine. (Photo by Roman Pilipey/AFP Photo)

Tactics reminiscent of the early American frontier days are now being used in Vietnam. Lieutenant Commander Donald D. Sheppard, UBN, of Coronado, California, aims a flaming arrow at a bamboo hut concealing a fortified Viet Cong bunker on the banks of the Bassac River, Vietnam on December 8, 1967. (Photo by AP Photo)

A U.S. Army crew chief flying on board a CH-47F Chinook helicopter observes the successful test of flares during a training flight in Afghanistan, March 14, 2018. (Photo by Tech. Sgt. Gregory Brook/Reuters/U.S. Air Force)

Ukrainian servicemen of the 28th Separate Mechanised Brigade fires a 122mm mortar towards Russian positions at the front line, near Bakhmut, Donetsk region, Ukraine, Sunday, March 3, 2024. (Photo by Efrem Lukatsky/AP Photo)

A Ukrainian Army liaison officer Vira, 22, plays with her rat Malyi (Tiny) at her positions near a frontline, in Donetsk region, Ukraine, on March 8, 2024. (Photo by Inna Varenytsia/Reuters)

Ukrainian soldiers from the assault brigade inflict fire damage with a 120 mm mortar while supporting the assault operations of the infantry on April 19, 2024 in Ukraine. The country's Prime Minister Denys Shmyhal has warned its allies that if more military aid for Ukraine is not approved soon, such as the long-stalled aid package from the United States, it could usher in a “Third World War”. (Photo by Kostiantyn Liberov/Libkos/Getty Images)

A Ukrainian serviceman from an anti-drone mobile air defence unit uses his mobile device near a ZU-23-2 anti aircraft cannon as he waits for Russian kamikaze drones, amid Russia's attack on Ukraine, in Kherson region, Ukraine on June 11, 2024. (Photo by Ivan Antypenko/Reuters)