The U.S. Army's oldest unit is in Down East Maine to help celebrate an initiative in which military personnel are remembered by placing replica dog tags in balsam fir trees.

According to the Associated Press, Wreaths Across America created the "tree tagging" program in which 1,000 dog tags adorn trees on property where balsam tips are collected to create holiday greenery for Arlington National Cemetery and other veteran cemeteries around the world.

The 3rd U.S. Infantry, known as "The Old Guard," is the Army's official ceremonial unit, serving as escort to the president and providing watch for the tomb of the unknown soldier.

The unit's U.S. Army Old Guard Fife and Drum Corps, U.S. Army Drill Team and the Continental Color Guard participated in Saturday's event capped with the rock band, Kansas reported AP.

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