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VILNIUS, LITHUANIA - NOVEMBER 23:  Soldiers of the U.S. 173rd Airborne Brigade participate in a parade in the city center during the Iron Sword multinational military exercises on November 23, 2016 in Vilnius, Lithuania. Approximately 4,000 soldiers from NATO countries, including all three Baltic states as well as the USA, are participating in two-week exercises. U.S. President-elect Donald Trump has suggested in past comments that he will review the U.S. commitment to defend NATO member states. The Baltic states, on the eastern geographic edge of the NATO alliance and close to Russia, see themselves at risk. They are concerned that Trump will not take the threat of potential Russian intervention in their countries seriously.  (Photo by Sean Gallup/Getty Images)
VILNIUS, LITHUANIA - NOVEMBER 23:  Soldiers of the U.S. 173rd Airborne Brigade participate in a parade in the city center during the Iron Sword multinational military exercises on November 23, 2016 in Vilnius, Lithuania. Approximately 4,000 soldiers from NATO countries, including all three Baltic states as well as the USA, are participating in two-week exercises. U.S. President-elect Donald Trump has suggested in past comments that he will review the U.S. commitment to defend NATO member states. The Baltic states, on the eastern geographic edge of the NATO alliance and close to Russia, see themselves at risk. They are concerned that Trump will not take the threat of potential Russian intervention in their countries seriously.  (Photo by Sean Gallup/Getty Images)

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There are thousands of US troops in Europe for a NATO show of force. CNN's Atika Shubert explains the one thing you need to know about it.