American Keith Broomfield was killed on June 3 while fighting alongside Kurdish forces against ISIS in Syria. Broomfield, 36, is from Massachusetts and is believed to be the first American to die while fighting with foreign forces against ISIS.
But there are other Americans, including veterans of the wars in Iraq and Afghanistan, who have traveled to Syria and Iraq to join in the battle against the self-proclaimed Islamic State.
Here & Now's Lisa Mullins speaks with Rebecca Collard, a contributor to Time magazine, who has written about foreigners joining the fight against ISIS.
This segment aired on June 12, 2015.