Originally posted by LibertygalAllow me to enlighten you, there are Federal laws about the flag.
§4. Pledge of allegiance to the flag; manner of delivery
The Pledge of Allegiance to the Flag: "I pledge allegiance to the Flag of the United States of America, and to the Republic for which it stands, one Nation under God, indivisible, with liberty and justice for all.", should be rendered by standing at attention facing the flag with the right hand over the heart. When not in uniform men should remove any non-religious headdress with their right hand and hold it at the left shoulder, the hand being over the heart. Persons in uniform should remain silent, face the flag, and render the military salute. [See Congressional Notes re use of "under God."]
There is more to it than just some silly custom.
All you have proven here is that Congress has declared in public code what the tradition and custom is. In all legal situations, the legal word should is not a mandate, but a description of propriety. Should and May are loophole words, meaning you don't have to do the act being described. If this was a legal requirement, the word would be MUST.
[edit on 11-17-2009 by rogerstigers]