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[WASHINGTON] President Barack Obama will confront his own legacy - seven years of intractable wars he once pledged to end - when he revisits two of America's bloodiest conflicts this week.
On visits to Vietnam and Hiroshima, Mr Obama will see the potency and limits of US military power up close. He won't apologize in Hiroshima for the US decision to drop atomic bombs in 1945, his spokesman said. Nor will he re-litigate US involvement in Vietnam that cost Lyndon Baines Johnson the presidency - and 58,000 Americans their lives.
Both stops conjure up "the question that is at the heart of the Obama strategic conundrum,'' said Peter Feaver, who served on the White House National Security Council under former Presidents Bill Clinton and George W Bush.
"And that is, does America do more harm through action or inaction, with its military?''
That question has vexed Mr Obama, who withdrew tens of thousands of troops from Iraq and Afghanistan, then returned some of them after extremists from Islamic State and the Taliban gained strength in regions the US vacated. He has been criticised by Republicans for being too reluctant to use military force in the region, and by some Democrats for being too willing.
"No matter how justified, war promises human tragedy," Mr Obama said in his 2009 Nobel Prize acceptance speech in Oslo.
"War itself is never glorious, and we must never trumpet it as such."
Yet even Mr Obama has learned, however reluctantly, that military power is a necessary tool for a president. In Vietnam, Mr Obama is considering lifting a ban on US arms sales imposed on the country after the war, with an eye toward China, which has forcibly challenged Vietnamese territorial claims in the South China Sea.
The region is beset by rising military tensions between China and its neighbors and on the Korean peninsula, where North Korea is advancing its nuclear weapons program.
As a presidential candidate, Mr Obama sought out military advice from former Senator Chuck Hagel, a Vietnam veteran and Republican who later became Mr Obama's defence secretary.
Mr Hagel said that he told the candidate, "We make big mistakes when we ignore histories and cultures. We can't impose democracies."
"His decisions to be very cautious with the use of military force and the commitment of military force certainly comes from his study and review and conversations regarding Vietnam," Mr Hagel said.
Those lessons are on display in Mr Obama's handling of Syria, where a five-year civil war has killed more than 270,000 people and prompted the worst refugee crisis since World War II. Mr Obama vacillated on his strategy before deciding not to use US military power to end the conflict.
'Smell of Vietnam'
Still, American pilots and more than 4,000 US ground troops are assisting local forces in Iraq and Syria, where they occasionally find themselves in combat. The US is also supporting a nascent United Nations effort to arm Libya's new government, and the president has sent American aircraft and unmanned drones to conduct targeted operations in Yemen, Somalia and Pakistan.
"The way in which he is handling the Middle East, not getting involved, it's the smell of Vietnam," said Marvin Kalb, a professor at Harvard's John F Kennedy School of Government.
"That legacy for a president who takes history seriously becomes guideposts for the way he conducts his policy. This is the man who wants more than anything to be known as the man who avoided wars, who didn't engage in wars."
Mr Obama will acknowledge the American military intervention in Vietnam, the only major war the US has lost, White House press secretary Josh Earnest said.
Mr Obama is the first US president to have reached adulthood after the Vietnam War. He was 13 when it ended, far too young to have served or avoided serving. His predecessors Bill Clinton and George W Bush, who each also visited the country, both avoided the draft.
The impact of the Vietnam War still resonates in that country, even though most Vietnamese weren't yet born when it ended. The average age in Vietnam is 29.6, according to the Central Intelligence Agency.
"The Vietnamese military still remembers the war," said Murray Hiebert, deputy director of the Center for Strategic and International Studies Southeast Asia Program.
Even if the US lifts the ban on arms sales, Vietnam's military might not be interested in American weapons for reasons that include the bloody history between the countries, he said.
The president will conclude his week-long trip in Hiroshima, recognizing the pair of atomic bombs that the US dropped there and in Nagasaki to force Japan's surrender in 1945 and end World War II. It will be the first visit by a US president to the Hiroshima Peace Memorial Park, an open field created by the explosion that killed tens of thousands.
Ben Rhodes, Mr Obama's deputy national security adviser, said the president will reflect on "the tremendous human cost of war" during brief remarks at the site.
Mr Obama's visit "kind of gives, especially for those aging and surviving victims and the families, some sense of closure. At least there's an acknowledgment of the destruction they experienced," said Yuki Tatsumi, a senior associate of the East Asia program at the Stimson Center, a non-profit research group in Washington.
And yet today, the Japanese people depend on their alliance with the US for military assurances against the threat of Chinese encroachment and North Korean nuclear weapons.
Mr Obama's appearance at the G-7 meeting in Ise Shima "is very important to demonstrate the US's continued willingness to engage," she said.