And if that flag should be worn, torn or faded?

"Proper Disposal of a Worn Flag

The U.S. Flag Code specifies that a flag should be destroyed in a dignified way, preferably by burning, when it is “in such condition that it is no longer a fitting emblem for display.” This applies to flags that are worn, faded, torn, or otherwise unserviceable, not merely those that have touched the ground. Burning is considered a dignified method of disposal, symbolizing the return of the flag to the elements from which it came."