As the Islamic State’s physical caliphate shrinks to nothing after an almost five-year campaign led by U.S. special operations forces, military insiders say one small unit has killed more of the extremists than any other: the company of Gray Eagle drones in the Army’s 160th Special Operations Aviation Regiment.

Although the military has thrown a cloak of secrecy over its operations, the unit — officially called E (or “Echo”) Company of the regiment’s Second Battalion and established less than a decade ago — is increasingly being lauded in special operations and Army aviation circles.

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