General Joseph Votel, who heads US Central Command (Centcom), met with leaders from the Syrian Democratic Forces in the first such trip under the new US administration.
SDF spokesman Talal Sello told AFP that Votel "discussed the increase of coordination and support (to the SDF) in the era of Donald Trump".
"There were promises of heavy weapons in future stages," Sello said.
In an online statement, Sello said Votel had met with several SDF commanders.
He described the meeting as "confirmation of US support for our forces".
An SDF source told AFP the visit lasted four hours.
According to a senior source in the SDF, "Votel confirmed the coalition's commitment to protecting Manbij from any attacks waged by Turkey or supported by it, as part of its previous commitment to protecting the area."
Manjib is a city in Aleppo province.
"We did not discuss opening corridors for Turkish-backed forces to enter areas under our control," the source said.
Votel made a similar trip to Syria in May 2016, meeting with SDF commanders as well as US military advisers working alongside them.
But this is his first trip under Trump's administration.
Founded in October 2015, the SDF is an alliance of Kurdish and Arab fighters that has seized swathes of territory from IS across northern Syria.
The United States has special operations forces advising the SDF on the ground in Syria, but no combat units.
On Wednesday, Votel told journalists travelling with him in the Middle East that more US troops might be needed in Syria, although he stressed local forces would be the primary force.
"It could be that we take on a larger burden ourselves.
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