Al-Qaeda has confirmed the death of Osama bin Laden and vowed to avenge his killing by U.S. forces.U.S. President Barack Obama has meanwhile declared that the terrorist group will eventually succumb to measures to destroy it.

Obama delivered his message during a visit May 6 to Fort Campbell, in the southern state of Kentucky, where he personally thanked the commandos who raided bin Laden's compound in Abottabad, Pakistan, on May 2.

The commandos are thought to be from Team Six, the most elite unit of a larger group of specialized soldiers known as the SEALs, an acronym that stands for Sea, Air, and Land -- the three theaters of their operations.

Obama also met with members of the 160th Special Operations Aviation Regiment, the highly specialized army unit that transported the commandos who carried out the raid.

Addressing a crowd of soldiers afterward, Obama said he told the raid team that they had honored America's promise to remember the September 11, 2001, attacks, which killed nearly 3,000 people.

"I had the privilege of meeting the extraordinary special ops -- the folks who honored that promise,” said Obama. “There was a chance for me say on behalf of all Americans and people around the world, 'Job well done.' 'Job well done.'"

Obama said the team had "practiced tirelessly" for what he called "one of the greatest intelligence and military operations in our nation's history."

"We're making progress in our major goal -- our central goal -- in Pakistan and Afghanistan, and that is disrupting and dismantling and we are ultimately going to defeat Al-Qaeda,” the president said, adding: “We have cut off their head and we will ultimately defeat them."