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TO GO WITH AFP STORY BY JONATHAN KROHN Brett (L) and Louis Park, two US nationals who fight jihadists of the Islamic State (IS) group alongside Dwekh Nawsha, a Christian militia whose name is an Assyrian-language phrase conveying self-sacrifice, shop for military equipment at a market in the Iraqi city of Dohuk on February 5, 2015, before joining his contingent in the northern town of Al-Qosh, located 35 km north of Mosul. The foreign contingent fighting IS is tiny compared to the thousands of foreigners who have joined the jihadist group, but interest is growing and 20 more volunteers already lined up to join. (Photo by Safin HAMID / AFP) (Photo by SAFIN HAMID/AFP via Getty Images)