A group may honor U.S. veterans and members of the armed forces by laying a wreath at the Tomb of the Unknown Soldier. Public wreath ceremonies are limited to one per group per day, with a maximum of four participants in the ceremony. The wreath for the ceremony is provided by the participants.
Well actually you can.
Public Wreath Ceremonies
A group may honor U.S. veterans and members of the armed forces by laying a wreath at the Tomb of the Unknown Soldier. Public wreath ceremonies are limited to one per group per day, with a maximum of four participants in the ceremony. The wreath for the ceremony is provided by the participants.
From: https://www.arlingtoncemetery.mil/Visit/Events-and-Ceremonies/Request-a-Ceremony
Students from my granddaughter’s school participated in a wreath ceremony when they toured Washington DC.