Arlington National Cemetery: Nation honors war heroes on Memorial Day

By Charles Dharapak, AP Audience members pause after President Obama spoke at Monday's Memorial Day Observance at Arlington National Cemetery. By Charles Dharapak, AP Audience members pause after President Obama spoke at Monday's Memorial DayPresident Barack Obama calls it the most wrenching decision that he's had to make -- the decision to send troops into harm's way. At Arlington National.Since 1868, Arlington National Cemetery has been the focal point of national Memorial

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