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Polish soldiers watch as US troops from the 5th Battalion of the 7th Air Defense Regiment emplace a launching station of the Patriot air and missile defence system at a test range in Sochaczew, Poland, on March 21, 2015 as part of a joint exercise with Polands troops of the 37th Missile Squadron of Air Defense that is to demonstrate the US Armys capacity to deploy Patriot systems rapidly within NATO territory. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)

Polish soldiers watch as US troops from the 5th Battalion of the 7th Air Defense Regiment emplace a launching station of the Patriot air and missile defence system at a test range in Sochaczew, Poland, on  March 21, 2015 as part of a joint exercise with Polands troops of the 37th Missile Squadron of Air Defense that is to demonstrate the US Armys capacity to deploy Patriot systems rapidly within NATO territory.     AFP PHOTO / JANEK SKARZYNSKI        (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)