Answer:
(a) The flag is half-staffed on Memorial Day, from sunrise until noon; it is displayed at full-staff from noon until sunset.
(b) By order of the President of the United States, or by the Governor of any State, territory or possession. On occasion, heads of several departments and agencies of the U.S. Government may direct the flag to half-staff if deemed proper to do so.
American Legion - Half-staff
