Mosul and ISF Combat Effectiveness

After a period of “operational refit,” Iraqi Security Forces (ISF) waging battle with Daesh fighters for control of the city of Mosul launched a new phase of their advance on 29 December. The initial phase of the assault, which began on 17 October 2016, ground to a halt due to strong Daesh resistance and heavy casualties among the Iraqi Counterterrorism Service (CTS) troops spearheading the operation.
For the new offensive, the CTS was reinforced with additional Iraqi Army ground units, as well as an armored element of the Federal Police. Additional U.S. combat forces and advisors have also been moved closer to the front lines in support.
Although possessing an enormous manpower advantage over the Daesh defenders, ISF had managed to secure only one-quarter of the city in two months of combat. This is likely due to the fact that the only ISF elements that have demonstrated any offensive combat effectiveness have been the CTS and the Popular Mobilization Forces (PMF, or Hash’d al Shaabi) Iraqi Shi’a militia mobilized by Grand Ayatollah Ali Sistani in 2014. PMF brigades hold the western outskirts of the city, but thus far have been restrained from entering it for fear of provoking sectarian violence with the mostly Sunni residents.
Daesh defenders, believed to number only from 3,000-5,000 at the outset of the battle, have had the luxury of fighting against only one axis of advance and within urban terrain filled with trapped civilians, which they have used as human shields. They mounted a particularly effective counterattack against the CTS using vehicle-borne improvised explosive devices (VBIEDs), which halted the initial offensive in mid-December. ISF casualties appear to be concentrated in the elite 1st Special Operations Brigade (the so-called “Golden Division”) of the CTS. An unnamed Pentagon source was quoted as stating that the Golden Division’s maneuver battalions had incurred “upwards of 50 percent casualties,” which, if sustained, would have rendered it combative ineffective in less than a month.
The Iraqi government has come to rely on the Golden Division to generate reliable offensive combat power. It spearheaded the attacks that recovered Tikrit, Ramadi, and Fallujah earlier in the year. Originally formed in 2004 as the non-sectarian Iraqi Special Operations Forces brigade, the Golden Division was amalgamated into the CTS in 2007 along with specialized counterterrorism and national police elements. Although intended for irregular warfare, the CTS appears to be the only Iraqi military force capable of effective conventional offensive combat operations, likely due to higher level of combat effectiveness relative to the rest of the ISF, as well as its interoperability with U.S. and Coalition supporting forces.
Historically, the Iraqi Army has not demonstrated a high level of overall combat effectiveness. Trevor Dupuy’s analysis of the performance of the various combatants in the 1973 Arab-Israeli War ranked the Iraqi Army behind that of the Israelis, Jordanians, Egyptians, and Syrians. He estimated the Israelis to have a 3.43 to 1.00 combat effectiveness advantage over the Iraqis in 1973. Dupuy credited the Iraqis with improved effectiveness following the 1980-88 Iran-Iraq War in his pre-war estimate of the outcome of the 1990-91 Gulf War. This turned out to be erroneous; overestimation of Iraqi combat effectiveness in part led Dupuy to predict a higher casualty rate for U.S. forces than actually occurred. The ineffective performance of the Iraqi Army in 2003 should have not surprised anyone.
The relative success of the CTS can be seen as either indicative of the general failure of the decade-long U.S. effort to rebuild an effective Iraqi military establishment, or as an exemplary success of the U.S. Special Operations Forces model for training and operating with indigenous military forces. Or both.

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