From VeteransToday:

The men are part of an unusual fringe of American veterans joining the war against Islamic State. They go, even as their president and Pentagon leaders strive to keep U.S. forces out of the ground war.

Mr. Windorski and Mr. Lane, 29, joined other Westerners going into combat alongside the Kurdish fighters who have proved to be one of the most effective forces confronting Islamic State. They met fighters from America and England, Greece and Australia, Israel and Iran.