American soldiers are pictured during a welcome ceremony at the Polish-German border in Olszyna, Poland on January 12, 2017. U.S. troops are being deployed in Poland under Operation Atlantic Resolve. The troops will be followed by 87 tanks, 144 Bradley fighting vehicles and 2,500 vehicles being transported by land from Germany. Natalia Dobryszycka/AFP/Getty Images hide caption

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Natalia Dobryszycka/AFP/Getty Images

U.S. Troops Arrive In Poland, But Will Trump Keep Them There?

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An Estonian soldier takes aim during a training exercise at Tapa Army Base, Estonia, on Nov. 17. U.S. troops were also taking part in the training, about 70 miles from the border with Russia. NATO countries are stepping up their presence in Eastern Europe at a time of rising tensions with Russia. Lucian Kim/NPR hide caption

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Lucian Kim/NPR

Near The Russian Border, U.S. And NATO Beef Up Their Presence

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Mary McLain for NPR

To Retain More Parents, The Military Offers A Better Work-Life Balance

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The U.S. Air Force Honor Guard carries the remains of World War II pilot Elaine Harmon during services on Wednesday at Arlington National Cemetery in Arlington, Va. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

LISTEN: Susan Stamberg on Female WWII Pilots, The Original Fly Girls

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Ameera, 6, walks with assistance at the Craig Joint Theater Hospital at Bagram Airfield, Afghanistan. She is recovering from a gunshot wound sustained when she was caught in a firefight between U.S. and Afghan soldiers and Taliban insurgents. Senior Airman Robert Dantzler/U.S. Air Force hide caption

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Senior Airman Robert Dantzler/U.S. Air Force

Ameera, A 6-Year-Old Afghan, Prepares To Walk Out Of U.S. Military Hospital

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A MiG-21 fighter — a leftover monument from the Soviet era — is the centerpiece of the Aviators Neighborhood in Deveselu, Romania. Now the base has become a U.S. Navy facility that is part of NATO's anti-missile shield for Europe. Gabriel Amza for NPR hide caption

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Gabriel Amza for NPR

Zabihuillah Niazi, a 25-year-old nurse, lost an eye and an arm when an American AC-130 gunship shelled the Medecins Sans Frontieres trauma center in Kunduz, Afghanistan, in October 2015, killing 42 people. Zabihullah Tamanna for NPR hide caption

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Zabihullah Tamanna for NPR

A scientist examines mosquitoes at the lab. Walter Reed Army Institute of Research hide caption

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Walter Reed Army Institute of Research

Volunteers Who Say 'Bite Me' Are Helping To Win The War Vs. Mosquitoes

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Defense Secretary Ash Carter (left) and Joint Chiefs Chairman Gen. Joseph Dunford, speak at the Pentagon on Friday. They announced that U.S. forces killed a senior Islamic State leader in an airstrike. Manuel Balce Ceneta/AP hide caption

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Manuel Balce Ceneta/AP

U.S. soldiers in Afghanistan walk away from a helicopter at Forward Operating Base Connelly in the eastern province of Nangarhar on Aug. 13. The U.S. formally ended combat operations in Afghanistan at the end of last year. But nearly 10,000 American troops remain in the country and the U.S. frequently carries out air sorties. Fourteen American military personnel have died in Afghanistan this year. Wakil Kohsar/AFP/Getty Images hide caption

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Wakil Kohsar/AFP/Getty Images

On May 21, an Afghan child is treated at a Doctors Without Borders hospital in the northern city of Kunduz, after being injured in a fight between the Taliban and Afghan security forces. Shah Marai/AFP/Getty Images hide caption

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Shah Marai/AFP/Getty Images

Sgt. Bowe Bergdahl faced a preliminary hearing in San Antonio last week. He faces a possible court-martial for walking off his base in Afghanistan in 2009. An Army investigation produced a wealth of new information on his motivations. The major general who led the inquiry recommended against a prison sentence. AP hide caption

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