As others have linked in this thread, emphasis mine:

CNN Chief Int'l Correspondent Clarissa Ward:

From @cnn @barbarastarrcnn clarifying Newsweek report of US base getting hit - Turkish artillery hit close to a US special operations unit in Kobani. The artillery shells hit several hundred meters from where the US special ops forces were located. No US injuries reported.

Pentagon Correspondent Aaron Mehta:

BREAKING: Senior US official says no US personnel were hurt in an explosion near Kobani in Syria. It was not a direct hit.

"Not accurate" to say US service members were attacked.

Notably official says DoD still verifying whether it was Turkish artillery that hit or not.

Directly from CNN:

Turkish artillery hit close to a US special operations unit near Kobani, Syria, a US official familiar with the initial assessment says. There are no US injuries in the early reports and no indication it was deliberate, the official says. https://cnn.it/2MDmAg6

TL;DR the headline is vague and misleading, no US soldiers were harmed, the artillery was a couple football fields away.

This was one of the most helpful comments. NOT my comment!!!