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British Air Chief Marshal Sir Stuart Peach salutes an honor guard during during an official welcoming ceremony in Ankara, Turkey in February. Anadolu Agency/Getty Images hide caption

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Members of the United States Army Special Forces, also known as the Green Berets, look through night vision goggles during a training of Afghanistan Special Forces on Sept. 10, in Helmand province, Afghanistan. Andrew Renneisen/Getty Images hide caption

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U.S. Army Green Berets Accused From Within Of Lowering Standards

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Bill Browder has become one of Russian President Vladimir Putin's most vocal enemies, as he's pushed for countries to enact sanctions that freeze the assets of human rights violators. Bertrand Guay /AFP/Getty Images hide caption

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New Year To Bring New Test For Trump Administration On Key Russia Sanctions

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Federal Terrorism Charges Filed Against Manhattan Subway Bombing Suspect

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Post Court Ruling, Military Will Accept Openly Transgender Recruits

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Transgender U.S. Army Capt. Jennifer Sims lifts her uniform during a July interview with The Associated Press in Beratzhausen near Regensburg, Germany. Matthias Schrader/AP hide caption

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Matthias Schrader/AP

The Challenges Of Regulating Autonomous Weapons

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Pentagon Officials Say Transgender People Can Enlist In Military Next Year

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What We Know So Far In NYC Subway Blast

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Suspect In NYC Blast Was Wearing 'Low-Tech' Device

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Police: 1 Suspect In Custody In N.Y. Subway Blast

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Protesters outside the federal courthouse where Michael Flynn pleaded guilty early this month speculate what is coming next in the special counsel probe. Chip Somodevilla/Getty Images hide caption

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FBI Director Christopher Wray defended the FBI and the special counsel's office before the House Judiciary Committee on Thursday. Win McNamee/Getty Images hide caption

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Preparing To Leave, National Counterterrorism Center Director Reviews Threats

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