see more

TIKRIT, IRAQ - NOVEMBER 10: Darkness gathers over the memorial to the Islamic State (ISIS) massacre of 1,700 Shiite Air Force cadets from Camp Speicher beneath a bridge where victims were shot and their bodies thrown into the Tigris River by the Sunni jihadist group in Tikrit, Iran, on November 10, 2016. Though the massacre on June 12, 2014, was the most lethal single event in Iraq since the 2003 American invasion, Sunni and Shiite leaders with the help of the Network of Iraqi Facilitators (NIF) and Washington-based United States Institute of Peace (USIP) help end the risk of revenge attacks and a sectarian blood feud, and negotiated the safe return of tens of thousands of Sunni families in a model of reconciliation that has lessons for post-ISIS Mosul. (Photo by Scott Peterson/Getty Images)

TIKRIT, IRAQ - NOVEMBER 10: Darkness gathers over the memorial to the Islamic State (ISIS) massacre of 1,700 Shiite Air Force cadets from Camp Speicher beneath a bridge where victims were shot and their bodies thrown into the Tigris River by the Sunni jihadist group in Tikrit, Iran, on November 10, 2016. Though the massacre on June 12, 2014, was the most lethal single event in Iraq since the 2003 American invasion, Sunni and Shiite leaders with the help of the Network of Iraqi Facilitators (NIF) and Washington-based United States Institute of Peace (USIP) help end the risk of revenge attacks and a sectarian blood feud, and negotiated the safe return of tens of thousands of Sunni families in a model of reconciliation that has lessons for post-ISIS Mosul. (Photo by Scott Peterson/Getty Images)