FILE - In this Jan. 15, 2018 file photo, U.S. Marines stand guard during the change of command ceremony at Task Force Southwest military field in Shorab military camp of Helmand province, Afghanistan. The Pentagon is developing plans to withdraw up to half of the 14,000 American troops serving in Afghanistan, U.S. officials said Thursday, Dec. 20, 2018, marking a sharp change in the Trump administration's policy aimed at forcing the Taliban to the peace table after more than 17 years of war. (AP Photo/Massoud Hossaini, File)

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