The killing of American-born al-Qaida preacher Anwar al-Awlaki may weaken the Yemen branch's ability to attack the United States, but the only way to eliminate the threat is to take out its Yemen leaders, according to a new report by a top Army counterterrorism center.

Terror chief Nasir al-Wahayshi, who used to work for Osama bin Laden in Afghanistan, and other key figures are the real secret to the group's survival, and are equally committed to attacks on the U.S. homeland, according to the report released Monday by the U.S. Military Academy's Combating Terrorism Center.

A year in the making and written before Friday's drone strike that killed al-Awlaki and fellow U.S.-born propagandist Samir Khan, the report also suggests that its leaders' strength is key to the group's end. Al-Qaida in the Arabian Peninsula's "reliance on this capable leadership is simultaneously the group's central vulnerability," said study editor Gabriel Koehler-Derrick.

"Removing these leaders from the battlefield ... would rapidly bring about the group's defeat," according to the study, made available exclusively to The Associated Press.

Al-Wahayshi was in charge when the group launched its first official attack, the dual suicide bombing of U.S. oil facilities in Yemen in 2006.

Another key figure still at large is military leader Abdullah al-Rimi, who is wanted for questioning in connection with the bombing of the USS Cole in Aden, Yemen, in 2000, in which 17 American sailors were killed.

Audio statements by both men "demonstrate unequivocal calls for jihad and attacks against the U.S." but have received less attention because they're in Arabic, Koehler-Derrick said.

In addition to targeting those leaders, the study's authors argue the Yemeni government can help defeat the group by cutting deals with a growing list of local opponents. Since unrest started in Yemen as part of the cascade of revolts known as the Arab Spring, al-Qaida's recent military campaign to seize and hold territory inside Yemen has won it many new enemies, the study authors assert.

Bin Laden's successor Ayman al-Zawahiri has backed seizing territory in Yemen to start down the road of establishing an Islamic caliphate, according to a senior intelligence official who spoke on condition of anonymity to discuss classified matters.

But that has woken two sleeping giants: the Yemeni government and the country's powerful tribes.

Before al-Qaida attacked the regime of President Ali Abdullah Saleh, there was an unwritten understanding that the government would largely leave al-Qaida alone as long as it left the regime in peace, according to two U.S. counterterrorism officials. They spoke anonymously to discuss a sensitive policy clash with the Yemeni government, which frustrated the Americans because it meant there were certain parts of Yemeni territory where the U.S. was unable to operate.

The Yemeni government started allowing the U.S. a freer hand after al-Qaida attempted to send explosive devices hidden in printer cartridges aboard U.S.-bound cargo planes last year, but only "allowed the U.S. to take the gloves off" once al-Qaida joined in the uprising and started seizing large swaths of Abyan province, one of the officials said.

That's when the Yemeni government started sharing much more intelligence with U.S. counterterrorism officials, and allowed them increase the presence of CIA officers and military advisers inside the country, working alongside Yemeni forces.

The Yemenis still don't allow the U.S. to fly armed drones and spy planes from Yemeni territory, instead forcing them to fly from a nearby secret CIA base in a nearby country, as well as bases in Djibouti and a temporary post in the Seychelles. But Yemen has allowed the U.S. to increase the number of flights and the territory they cover, even suggesting occasional targets which may or may not be al-Qaida-related _ so much so that the U.S. has had to guard against the Saleh government employing U.S. firepower against other internal rivals to stay in power, the two U.S. officials said.

As for Yemen's tribes, al-Qaida has "utterly failed" at winning them over, Koehler-Derrick said. "None of its prominent leaders are tribesmen and it enjoys no formal alliance with Yemen's tribes," he said.

And in the power struggle among Yemeni tribes and opposition political parties, al-Qaida falls to the bottom of the heap in terms of public popularity, Koehler-Derrick added.

If the Yemeni government cuts deals with its opponents, as Saleh has done in the past, they'd form a majority that would overwhelm al-Qaida, the report suggests. That would also undermine al-Qaida's message that change only comes through jihad _ a religious struggle. Instead, as in the revolutions in Tunisia, Egypt and Libya, it would signal that change can come through a far more secular form of revolution.

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Online:

http://www.ctc.usma.edu/posts/a-false-foundation-aqap-tribes-and-ungoverned-spaces-in-yemen

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AP Intelligence writer Kimberly Dozier can be followed on Twitter (at)kimberlydozier.