RIGA, April 28, 2016 (Xinhua) --U.S. soldiers take part in the Operation Summer Shield XIII military exercise held at Adazi Training Area outside Riga, Latvia, April 28, 2016. About 1300 soldiers from Latvia, Lithuania, the United States, Canada, Finland and Germany etc. took part in the military exercise from April 17 to 29. (Xinhua/Guo Qun)
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