Iraq’s special forces, which barreled into a town east of Mosul on Thursday despite a wave of suicide attacks, are the country’s most professional and least sectarian fighting force.

Officially known as the Counter Terrorism Service, the U.S. trained troops have played a key role in wresting back towns and cities from IS, and are expected to lead the charge in Mosul, their toughest battle yet.

Here is a look at Iraq’s special forces:

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