The Pentagon says U.S. military personnel in Syria are moving ahead with President Trump's order to pull out of the war-torn country.

The U.S. force in Syria has "begun the process of our deliberate withdrawal from Syria," said Col. Sean Ryan, spokesman for the for Combined Joint Task Force - Operation Inherent Resolve. More than 2,000 U.S. troops are currently deployed in Syria.

In the past 24 hours, U.S. forces have withdrawn 10 vehicles and 150 personnel from the Rmelan military base, one of the first installations the U.S.-led coalition established in Syria in 2014, according to the Syrian Observatory for Human Rights. Those military vehicles were seen traveling into Iraq; it's not clear how the reported movements compare to standard rotations of equipment and personnel.

The Defense Department did not directly address that report. "Out of concern for operational security, we will not discuss specific timelines, locations or troops movements," Ryan said.

News of the first steps of a withdrawal come as the U.S. is negotiating with Turkey about guaranteeing protections for U.S.-allied Kurdish fighters. Turkish President Recep Tayyip Erdogan's government considers the Kurdish YPG militia in Syria to be a terrorist organization linked to Kurdish separatist groups within Turkey.

On Friday, U.S. national security adviser John Bolton said those talks will continue into next week. They're taking place even as Erdogan says his military is prepared for a possible operation in northern Syria.

Questions have swirled around the withdrawal order since Trump made the unexpected announcement last month. It also sparked criticisms that the U.S. is pulling out of Syria before ISIS is truly defeated — abandoning America's Kurdish allies in the region, ceding hard-won influence to neighboring Turkey, and rewarding Russia's intervention alongside the Syrian regime.

Turkey welcomed Trump's surprise order to the Pentagon, while other U.S. NATO allies said they received no notice. Within the Trump administration, disagreement over the pullout quickly led to the resignations of both Defense Secretary Jim Mattis and Brett McGurk, the president's special envoy to the coalition fighting ISIS.

The timeline for withdrawal has been the subject of shifting statements from the White House, which has been accused of sending mixed messages about its mission in Syria and its broader priorities in the Middle East.

Secretary of State Mike Pompeo is currently on an eight-day tour to try to ease concerns about Trump's policies in the region. On Thursday, Pompeo declared that the U.S. is a "force for good" in the Middle East. On Friday, he told Egyptian state TV that the U.S. will pull out of Syria as the president ordered, "but we'll do so in a way that makes sense, that is orderly, that does everything we can to ensure the security of those who fought alongside us defeating the caliphate inside of Syria."

When Trump ordered the U.S. pullout on Dec. 19, he declared victory over ISIS and said, "Our boys, our young women, our men, they're all coming back, and they're coming back now."

But after the resignations of Mattis and McGurk and amid a wave of bipartisan criticism in Washington, Trump hinted at a longer timeframe. On Dec. 23, he said there would be a "slow & highly coordinated pullout of U.S. troops from the area."

Bolton said last weekend in Jerusalem that the drawdown is conditional and doesn't have a hard deadline.

"There are objectives that we want to accomplish that condition the withdrawal," the national security adviser told reporters. "The timetable flows from the policy decisions that we need to implement," he said, seemingly referring to the battle against ISIS and the future of the Kurdish fighters in Syria.

Bolton's comments angered Erdogan, who abruptly canceled a planned meeting earlier this week.

Instead, Erdogan gave a speech to Parliament in which he rejected the idea that Turkey would not harm Kurdish fighters and said his country will allow no concessions in its war against terrorism.

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