At the top the organisation is the self-declared leader of all Muslims, Abu Bakr al-Baghdadi, a radical chief executive officer of sorts, who handpicked many of his deputies from among the men he met while a prisoner in American custody at the Camp Bucca detention centre a decade ago.
He had a preference for military men, and so his leadership team includes many officers from Saddam Hussein's long-disbanded army.
They include former Iraqi officers like Fadel al-Hayali, the top deputy for Iraq, who once served Hussein as a lieutenant colonel, and Adnan al-Sweidawi, a former lieutenant colonel who now heads the group's military council.
The pedigree of its leadership, outlined by an Iraqi who has seen documents seized by the Iraqi military, as well as by American intelligence officials, helps explain its battlefield successes: Its leaders augmented traditional military skill with terrorist techniques refined through years of fighting American troops, while also having deep local knowledge and contacts. ISIS is in effect a hybrid of terrorists and an army.
"These are the academies that these men graduated from to become what they are today," said the Iraqi, a researcher named Hisham Alhashimi.
ISIS, which calls itself Islamic State, burst into global consciousness in June when its fighters seized Mosul, Iraq's second-largest city, after moving into Iraq from their base in Syria.
The Iraqi Army melted away, and Baghdadi declared a caliphate, or Islamic state, that erased borders and imposed Taliban-like rule over a large territory. Not everyone was surprised by the group's success. "These guys know the terrorism business inside and out, and they are the ones who survived aggressive counterterrorism campaigns during the surge," said one American intelligence official, referring to the increase in American troops in Iraq in 2007. "They didn't survive by being incompetent." The official spoke on condition of anonymity because he was discussing intelligence reports.
After ISIS stormed into Mosul, one official recalled a startling phone call from a former major general in one of Hussein's elite forces. The former general had appealed months earlier to rejoin the Iraqi Army, but the official had refused. Now the general was fighting for ISIS and threatened revenge.
"We will reach you soon, and I will chop you into pieces," he said, according to the official, Bikhtiyar al-Qadi, of the commission that bars some former members of Hussein's Baath Party from government posts.
ISIS's success has alarmed American and regional security officials, who say it fights more like an army than most insurgent groups, holding territory and coordinating operations across large areas.
The group has also received support from other armed Sunni groups and former members of the Baath Party - which was founded as a secular movement - angry over their loss of status.
"In the terrorism game, these guys are at the centre of a near perfect storm of factors," the American official said.
Baghdadi's deputies include 12 walis, or local rulers; a three-man war cabinet; and eight others who manage portfolios like finance, prisoners and recruitment.
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