The flag must be flown at half-staff when the President decrees official mourning. In addition, state and local governments may decree official mourning with the death of a mayor or governor. When the flag is displayed at half-staff, prior to raising or lowering it, the flag must be raised to the top of the flagpole and then lowered to the halfway mark. When the flag is being carried in procession, a black crape ribbon must be tied to the top of the mast.
