HARRACHOV, CZECH REPUBLIC - MARCH 29:  A supporter welcomes U.S. soldiers of the 3rd Squadron, 2nd Cavalry Regiment of the U.S. Army at the Czech-Poland border on March 29, 2015 in Harrachov, Czech Republic.  U.S. soldiers are travelling in the 'Dragoon Ride' convoy from Estonia to their home base in Vilseck, Bavaria, Germany. The soldiers have been taking part in an Atlantic Resolve exercises in the Baltic countries, designed to show that NATO is prepared to defend its members and launched last year in response to Russia's aggression in the Ukraine.  (Photo by Matej Divizna/Getty Images)