General Martin Dempsey, who Friday took over as the US military's top officer, has led soldiers in combat in Iraq and is keenly aware of the growing strain on the force after years of war.

An Irish-American who taught English literature to cadets at West Point, the 59-year-old graduated from the same class at the military academy as another four-star general, David Petraeus.

Until now, Petraeus -- who rose to fame as commander in Iraq and had stepped down as chief in Afghanistan to take over the CIA -- had largely overshadowed his former classmate.

As commander of the 1st Armored Division in Iraq in 2003-2004, Dempsey oversaw tanks and troops that fought insurgents led by Shiite cleric Moqtada al-Sadr, pushing the militia out of southern cities.

In his new job as chairman of the Joint Chiefs of Staff, Dempsey's two combat tours will help shape how he advises the president as the United States wraps up its mission in Iraq and begins to withdraw some of the 100,000 American troops in Afghanistan.

"One of things he'll bring to the job is current experience in the wars that we're in," said David Barno, a retired lieutenant general and senior adviser at the Center for a New American Security.

Dempsey takes over as chairman at a time of turmoil in the Arab world and growing pressure on the defense budget, with the Pentagon bracing for cuts and a possible scaled-back force.

Unlike the outgoing chairman Admiral Mike Mullen -- a reserved figure with a soft-spoken manner -- Dempsey is an extrovert with an irreverent sense of humor and a penchant for singing in public.

Proud of his working-class roots in New York and New Jersey, Dempsey's favorite tune is Frank Sinatra's rendition of "New York, New York," which he belts out with gusto in unabashed performances captured on YouTube.

Apart from Petraeus, Dempsey had another prominent classmate as a younger officer.

At the US Army's staff college in the 1980s, Dempsey got to know a Pakistani officer, Ashfaq Kayani -- now Pakistan's powerful army chief who has clashed with the United States in the aftermath of the raid that killed Osama bin Laden.

Dempsey is known as a thoughtful, independent-minded leader who shuns formalities and goes out of his way to hear from junior officers, said Barno, a friend and former colleague.

At Central Command, Dempsey was "known for going to the back rows of the auditorium when he was giving his morning updates, asking junior officers what they thought," Barno said.

He has "an ability to feel the soul of the organization, to really feel what young soldiers and young leaders are going through and to connect with them in ways better than almost anyone I know," Barno told AFP.

Steeped in US strategy on the Middle East having served as a deputy and acting chief of Central Command, Dempsey likely will focus much of his time on potential threats arising from the political earthquake shaking the region.

Formerly in charge of training and doctrine, Dempsey worked to ensure the Army absorbed the lessons of a decade of counter-insurgency warfare, and warned his superiors that the long-running wars have undercut training efforts and jeopardized the health of the force.

In describing his time in Iraq, Dempsey has stressed the importance of restraint, with troops moving in carefully instead of blasting away indiscriminately.

"In terms of precision, at no time did we work our way through a city building by building or room by room," Dempsey once said in an interview.

"If we did go in on the ground, we penetrated, attacked the militia and then moved back out to minimize the risk of being seen as creating excessive collateral damage or prolonging suffering needlessly."

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