The proper protocol for flying the American Flag on Memorial Day slightly differs from other occasions when flags are flown at half-staff. On Memorial Day, flags are lowered to half-staff, where they remain from sunrise until noon to honor the dead servicemen and women of this country.
At noon, the flags are raised quickly to full-staff in recognition of living military veterans who served the country. The flags remain at full staff until sunset. Whenever the flag is flown at half-staff, other flags (including state flags) should be removed or flown at half-staff as well.