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U.S. Secretary of Defense Mark Esper welcomes German Defense Minister Annegret Kramp-Karrenbauer at the Pentagon in Arlington, Virginia, the United States, on Sept. 23, 2019. (Photo by Ting Shen/Xinhua)

U.S. Secretary of Defense Mark Esper welcomes German Defense Minister Annegret Kramp-Karrenbauer at the Pentagon in Arlington, Virginia, the United States, on Sept. 23, 2019. (Photo by Ting Shen/Xinhua)