Trump places flags at Arlington graves in annual Memorial Day ritual

The president and first lady visited Arlington National Cemetery.

Eight active duty soldiers assisted the Trumps.

All told, soldiers from the U.S. Army's "Old Guard" -- the 3rd U.S. Infantry Regiment-- carefully places American flags in front of more than 228,000 headstones on Thursday as they have done now for more than 60 years.

Each flag must be placed at the center, exactly one foot in front of the headstone.

All flags will be removed after Memorial Day, before the cemetery opens to the public.