Silence and respect are the watch words at the tomb of the unknown soldier !

 You may not agree with everything that the country or its officials do, but the ideas of our hard fought for freedoms and rights must be preserved and respected for us and our VALID attempts at bettering the world as we try to honor, abide and improve the lot of all, with proper observances for those fallen in our service, so help us God, our creator.

http://www.allproudamericans.com/No-Laughing-at-the-Tomb-of-the-Unknown-Soldier.html