national flags can be flown at half-staff after the death of a serving or former official or serving member of the armed ...

The flag included a blue star for every immediate family member serving in the armed forces of the United States, during any period of war or hostilities in which the armed forces of the United ...

There are specific holidays and events for which flags are flown at half-staff in the United States ... unless that day is also Armed Forces Day. Patriot Day. National Pearl Harbor Remembrance ...