In this April 14, 2017, file photo, Afghan commandos arrive at Pandola village near the site of a U.S. bombing in the Achin district of Jalalabad, east of Kabul, Afghanistan. As the administration of President Donald Trump weighs sending more troops to Afghanistan, the 16-year war grinds on in bloody stalemate. Afghan soldiers are suffering what Pentagon auditors call “shockingly high” battlefield casualties, and prospects are narrowing for a negotiated peace settlement with the Taliban. (Photo by Rahmat Gul/AP Photo)





South Korean Marines take position on a beach as amphibious assault vehicles fire smoke shells during a joint landing operation by US and South Korean Marines in the southeastern port of Pohang on April 2, 2017. The drill is part of the annual joint exercise Foal Eagle to enhance the combat readiness of the US and South Korea supporting forces in defense of the Korean Peninsula. (Photo by Jung Yeon-Je/AFP Photo)





Picture taken on January 14, 2017 shows an Estonian Kaitseliit paramilitary volunteer firing a machine gun in Narva, Estonia. Like other east Europeans, Estonians were deeply disturbed by Russia's 2014 annexation of Crimea and its subsequent support for separatists in eastern Ukraine. US President-elect Donald Trump then raised more concerns with his campaign threat to think twice about defending NATO's eastern allies. These factors coupled with Kremlin sabre rattling in the Baltic region – especially in its heavily militarised Kaliningrad exclave – have triggered a paramilitary revival in eastern European states that were under Moscow's thumb during the Soviet era. (Photo by Raigo Pajula/AFP Photo)





British soldiers with the NATO force try to secure the site of a suicide attack in Afghanistan's southern Helmand province October 19, 2006. Several Afghans and two NATO soldiers were killed when a suicide bomber threw himself at the troops in southern Afghanistan, witnesses and an army officer said. (Photo by Abdul Qodous/Reuters)





A Member of Austrian special operations unit Jagdkommando performs an exercise in Wiener Neustadt, Austria, March 31, 2017. (Photo by Heinz-Peter Bader/Reuters)





A Canadian army medic examines one of eight children brought to a forward operating base after they fell gravely ill from eating explosive powder at a home in the Panjwai district of Kandahar province September 12, 2009. (Photo by Finbarr O'Reilly/Reuters)





U.S. Marine Lance Corporal Chris Sanderson, 24, from Flemington, New Jersey shouts as he tries to protect an Afghan man and his child after Taliban fighters opened fire in the town of Marjah, in Nad Ali district, Helmand province, February 13, 2010. (Photo by Goran Tomasevic/Reuters)





NATO soldiers take cover from dust and debris from a Chinook helicopter landing after a security handover ceremony at a military academy outside Kabul June 18, 2013. (Photo by Omar Sobhani/Reuters)





An Afghan woman clad in a burqa walks past French soldiers from the NATO in Kabul April 1, 2008. (Photo by Ahmad Masood/Reuters)





A pro-Russian rebel displays a captured Ukrainian flag at the destroyed airport in Luhansk, eastern Ukraine, September 14, 2014. Ukraine's defence minister said on Sunday that NATO countries were delivering weapons to his country to equip it to fight pro-Russian separatists and “stop” Russian President Vladimir Putin. (Photo by Marko Djurica/Reuters)





U.S Army combat camera photographer Spc. Hilda Clayton took this photo July 2, 2013 that was released by the U.S. Army, that shows an Afghan soldier engulfed in flame as a mortar tube explodes during an Afghan National Army live-fire training exercise in Laghman Province, Afghanistan. The accident killed Clayton and four Afghan National Army soldiers. (Photo by Spc. Hilda Clayton/U.S. Army via AP Photo)





In this May 6, 2006 file photo, a British trooper falls after apparently being hit by a rock, as British troops move towards a helicopter crash site in Basra, Iraq's second-largest city, 550 kilometers (340 miles) southeast of Baghdad. Britain’s prime minister announced plans on October 4, 2016 to protect British troops from dubious legal claims made during conflicts. (Photo by Nabil Al-Jurani/AP Photo)