India, May 25 -- Hundreds will honor the Tomb of the Unknown Soldier at Arlington National Cemetery on Memorial Day. The ceremony includes a prelude from the United States Marine Corps band and a full honor wreath laying. Generally, the president also attends the event. Memorial Day is observed each year on the last Monday in May. This year it is on May 26.

On Memorial Day each year, the 3rd US Infantry Regiment, also known as 'The Old Guard', places more than 260,000 American flags at Arlington National Cemetery and the US Soldiers' and Airmen's Home National Cemetery.

Soldiers then place the flags at one booth length in front of each headstone. This is known as 'Flags In'. Flags are also placed at the Tomb of the Unknown Soldier.

The...