Roughly 650 US troops are expected to remain in Afghanistan to provide security for diplomats after the main American military force completes its withdrawal, which is set to be largely done in the next two weeks, US officials said.

In addition, several hundred additional American forces will remain at the Kabul airport, potentially until September, to assist Turkish troops providing security, the officials said Thursday.

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Overall, officials said the US expects to have American and coalition military command, its leadership and most troops out by July Fourth, or shortly after that, meeting an aspirational deadline that commanders developed months ago.

The departure of the bulk of the more than 4,000 troops that have been in the country in recent months is unfolding well before President Joe Biden’s Sept. 11 deadline for withdrawal. And it comes amid accelerating Taliban battlefield gains, fueling fears that the Afghan government and its military could collapse in a matter of months.

Officials have repeatedly stressed that security at the Hamid Karzai International Airport in Kabul is a critical requirement to keeping any US diplomatic staff in Afghanistan.

Still, the decision to keep additional troops there for several more months makes it more complicated for the Biden administration to declare a true end to America’s longest war until later this fall.

In a statement Thursday night, Pentagon press secretary John Kirby said that as Biden has ordered, the US will complete the withdrawal by early September. “Nothing has changed about that goal.” Kirby said. “The situation is dynamic, and we review our progress daily. Speculation by unnamed sources about potential changes to that timeline should not be construed as predictive.”

On Friday, Afghan President Ashraf Ghani and Abdullah Abdullah, chair of the High Council for National Reconciliation, are meeting with Biden at the White House. The two Afghan leaders also are to meet at the Pentagon with Defense Secretary Lloyd Austin and possibly other administration officials, the Pentagon announced.

Getting most troops out by early July had been in doubt because of complications including an outbreak of Covid-19 at the US Embassy and the push to get Afghan interpreters and others who helped the US out of the country.

As recently as last week, there was discussion of possibly extending the US troop presence at Bagram Airfield, north of Kabul, but officials said the US presence at the base is expected to end in the next several days.

Officials said the US has agreed to leave a C-RAM – or Counter-Rocket, Artillery, Mortar system – at the airport, as well as troops to operate it, as part of an agreement with Turkey. The US also plans to leave aircrew for helicopter support at the airport.

According to the officials, Turkey has largely agreed to provide security at the airport as long as it receives support from American forces. US and Turkish military officials are meeting in Ankara this week to finalize arrangements.

On Wednesday, Army Gen. Mark Milley, chairman of the Joint Chiefs of Staff, said there is not yet a written agreement with Turks on airport security. He said he did not want to speak about specifics before there is a final agreement, but added, “I feel very comfortable that security at the Kabul airport will be maintained and the Turks will be a part of that.”

The administration intends to carry out the evacuation of Afghans and their families to other countries or US territories later this summer, likely in August while their visa application are processed, according to a second official familiar with the deliberations but not authorized to discuss them publicly.

The Pentagon has said the military is prepared to assist the State Department as needed but indicated that charter flights might be adequate to move the Afghan visa applicants, thus not necessarily requiring a military airlift.

Officials said that NATO allies, such as Germany, are also very close to being completely out of the country.