Hunting ISIS

Unpaid and unsanctioned by their own government, a handful of American volunteers have left their homes and loved ones to join the fight against ISIS in Iraq and Syria.

Itching for a fight, PJ transfers to an offensive unit in Syria where he's assigned to liberate the strategic ISIS-held town of Al-Shaddadi.

PJ's unit in Syria attacks the ISIS-held city of Al-Shaddadi, but heavy combat evades them once again. A frustrated PJ heads home to the States, leaving Levi and the others behind.

The long-anticipated siege of Mosul finally begins on the city's eastern limits. ISIS intensifies their tactics, meaning mounting casualties for the medics.

PJ returns to Syria, inspired by Levi's sacrifice and intent on reaching ISIS' "capital," Raqqa. In Iraq, ISIS is losing ground in Mosul.

A reinvigorated Pete returns to Iraq with his girlfriend Alex at his side. In Syria, an unexpected snafu leaves PJ weighing his options.