This year, with the threat of the Islamic State militant group looming, Obama’s rhetoric of remembrance
is circling back to earlier days and striking a less triumphant tone. Even so, he offered reasons for
optimism Thursday in brief remarks at the Pentagon’s 9/11 memorial.

"Thirteen years after small and hateful minds conspired to break us, America stands tall and America
stands proud," the president said.

He did not mention the administration’s new plan to step up military and diplomatic action against the
Islamic State group. Instead, he chose to remind Americans that "three months from now our combat
mission in Afghanistan will come to an end."

But in an address to the nation about the terrorist threat a day ahead of the 9/11 anniversary, Obama
acknowledged, "We cannot erase every trace of evil from the world, and small groups of killers have
the capacity to do great harm. That was the case before 9/11, and that remains true today."

He was speaking to a public that is increasingly worried about Islamic extremism. Six in 10 Americans now
are very concerned about the rise of Islamic extremism around the world, the largest share since 2007,
according to a new survey from the Pew Research Center

"The picture of the United States winding down the war on terror has become harder to sell in the
last couple of years," says Peter Feaver, a Duke University expert on war and public opinion.
"The old rhetoric that we are just about to win the war on terror can’t be sustained."

A few minutes before 9 a.m. EDT Thursday, Obama emerged from the White House with his wife, Michelle, and
Vice President Joe Biden to observe a moment of silence marking the 13th anniversary of the terror
attacks in New York, Shanksville, Pa., and at the Pentagon in suburban Arlington, Va., across the
Potomac River.

The Obamas planned to take part in a service project later in the day. Biden, for his part, joined a
group of volunteers at midday helping to assemble care packages for first responders and U.S. troops.

A look back at how Obama has framed his 9/11 message over the years.

___

2009: A new president stresses service, resolve.

In his first turn at the presidential bullhorn on 9/11, Obama tried to buck up war-weary Americans with a
call to service and common purpose.

"Let us renew the true spirit of that day — not the human capacity for evil, but the human capacity
for good," Obama said at a Pentagon memorial service. He called on Americans to "summon once
more that ordinary goodness of America, to serve our communities, to strengthen our country to better
our world."

Obama said he was "mindful that the work of protecting America is never finished."

___

2010: A call for tolerance amid growing religious tensions.

A Florida preacher’s call to burn Qurans and growing tension over plans to build a mosque near ground
zero in New York hung over the ninth anniversary of 9/11. Obama responded with a call for tolerance.

"They may seek to spark conflict between different faiths, but as Americans we are not — and never
will be — at war with Islam," Obama said. "It was not a religion that attacked us that
September day; it was al-Qaida, a sorry band of men which perverts religion. And just as we condemn
intolerance and extremism abroad, so will we stay true to our traditions here at home as a diverse and
tolerant nation."

___

2011: Taking stock of progress on 10th anniversary of attacks.

Obama used the 10th anniversary of the 9/11 attacks to take the measure of a decade’s progress.

"These past 10 years have shown that America does not give in to fear," he said.

"Our people still work in skyscrapers," Obama said. "Our stadiums are still filled with
fans, and our parks full of children playing ball. … This land pulses with the optimism of those who
set out for distant shores, and the courage of those who died for human freedom."

Overall, he said, "10 years later, I’d say America came through this thing in a way that was
consistent with our character."

With the wars in Afghanistan and Iraq drawing to a close, he looked forward to "a future of
peace."

___

2012: Taking a break from politics in an election year; tragedy strikes in Benghazi.

Obama and GOP rival Mitt Romney took a break from presidential politics on 9/11, with Obama and his wife
walking among the graves of the most recent war dead at Arlington National Cemetery.

"It’s because of their sacrifice that we’ve come together and dealt a crippling blow to the
organization that brought evil to our shores," Obama said, delivering an upbeat assessment of the
waning terror threat. "Al-Qaida’s leadership has been devastated and Osama bin Laden will never
threaten us again. Our country is safer and our people are resilient."

Within hours, word surfaced that four Americans had been killed in an attack on a U.S. compound in
Benghazi, Libya.

___

2013: Shadows of Syria hang over anniversary.

The prospect of more U.S. military action in the Middle East hung in the air.

"Let us have the strength to face the threats that endure, different though they may be from 12
years ago, so that as long as there are those who would strike our citizens, we will stand vigilant and
defend our nation," Obama said.

He spoke on the morning after an address to the nation in which he defended a possible military strike on
Syria in retaliation for a deadly chemical weapons attack. The airstrikes never happened, and Syria
began dismantling its chemical weapons stockpiles. But there were new allegations of chlorine attacks in
Syria over the summer.

___

2014: The threat of airstrikes against Syria is back as Obama develops his strategy to counter militants
of the Islamic State group.

He didn’t mention that Thursday. But in his speech Wednesday, Obama said: "Tomorrow marks 13 years
since our country was attacked. Next week marks six years since our economy suffered its worst setback
since the Great Depression. Yet despite these shocks, through the pain we have felt and the grueling
work required to bounce back, America is better positioned today to seize the future than any other
nation on Earth."

___

White House reporter Nedra Pickler contributed to this story.

___

Follow Nancy Benac on Twitter at http://twitter.com/nbenac