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NEW YORK (AP) - The nation is marking Memorial Day weekend with somber ceremonies, flag planting at cemeteries and parades while President Barack Obama makes a surprise trip to Afghanistan to visit U.S. troops.

In New York City, a Marines Corps chaplain gave a sermon Sunday at the Marble Collegiate Church. Afterward, worshippers planned to tie memorial ribbons on the church's fence.

There will be gold ribbons for service members killed in Afghanistan, green ribbons representing prayers for peace and blue ribbons for the people of Afghanistan.

On Saturday, Democratic congresswoman Tammy Duckworth served as grand marshal of Chicago's Memorial Day Parade. She lost her legs while serving in Iraq.

In Massachusetts, a Boston Marathon survivor and his rescuer helped plant tens of thousands of flags at a cemetery to honor soldiers.

(Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

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