The surge of 1,100 troops to the country has been going on for months without being disclosed publicly.
The soldier is being held in a Navy brig in California.
The U.S. will relocate most of the forces it's deployed in Chad, and the majority of the U.S. personnel assigned to Niger are also expected to depart.
By Tara Copp, AP
As the humanitarian crisis in Gaza mounts, a growing group of Democrats pushes Biden to apply human rights laws to Israel security assistance.
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