An Iraqi Shiite militia fighter holds a position in Salahuddin province, north of Baghdad, on May 26. With the Iraqi military performing poorly, militias have played an increasingly important role in the fight against the Islamic State. Mohammed Sawaf/AFP/Getty Images hide caption

itoggle caption Mohammed Sawaf/AFP/Getty Images

An Iraqi soldier takes position in Iraq's Anbar province. The U.S. will send 450 military advisers to Iraq to help in the fight against ISIS, but they will have a another challenge to gain the trust of Sunni leaders, as they did in 2007. Haidar Hamdani/AFP/Getty Images hide caption

itoggle caption Haidar Hamdani/AFP/Getty Images

Kurdish Peshmerga fighters are separated from Islamic State extremists by only short distances in some places around Mosul in northern Iraq, but there has not been heavy fighting recently or any changes in the front lines. Alice Fordham/NPR hide caption

itoggle caption Alice Fordham/NPR

Karim Wasfi, conductor of the Iraqi National Symphony Orchestra, at his home in Baghdad, has been playing his cello at the sites of explosive attacks in Baghdad. Ahmed Qusay for NPR hide caption

itoggle caption Ahmed Qusay for NPR

An Islamic State fighter holds holds a rifle and the group's flag shortly after capturing the northern Iraqi city of Mosul in June 2014. Dozens of Americans have been accused of planning or heading off to the Middle East to join the group. Their individual cases are on the chart below. Reuters/Landov hide caption

itoggle caption Reuters/Landov