The Iraqi Fight Against ISIS Divides a Splintered Nation

Fighters from the Iraqi Imam Ali Brigade take part in a training exercise in Iraq's central city of Najaf on March 7, 2015, ahead of joining the military operation in the city of Tikrit.
( HAIDAR HAMDANI/AFP / Getty )

Produced by Thalia Beaty and Jillian Weinberger

Produced by PRI and WNYC