Barack Obama marked his first Memorial Day as president on Monday, calling on Americans to remember U.S. troops who died in the service of their country and navigating a Civil War memorial controversy.
The president participated at the 141st annual Memorial Day wreath-laying ceremony at Arlington National Cemetery's Tomb of the Unknowns.
The men and women buried at Arlington "waged war so that we may know peace," Obama said. 
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CNN's Emily Schultze contributed to this report.
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