When the defining history of the fight against the Islamic State is written, it will record that U.S. and British special operations forces wreaked havoc upon the enemy.

The major effort began in 2014 in support of U.S. air operations against the ISIS caliphate. It was led by three of the finest units in the global special operations community: the 1st SFOD-Delta, Britain’s 22nd Special Air Service regiment, and the CIA’s paramilitary unit, SOG.