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A boy stands on an armored vehicle during NATO Day in Bydgoszcz, Poland, on Oct. 14, 2017. NATO has a training center in the city and offers the public opportunities to visit on the open day. (Xinhua/Jaap Arriens)
A boy stands on an armored vehicle during NATO Day in Bydgoszcz, Poland, on Oct. 14, 2017. NATO has a training center in the city and offers the public opportunities to visit on the open day. (Xinhua/Jaap Arriens)