President Obama has ordered flags flown at half-staff to honor victims of the July 14 truck attack in Nice, France.
Flags should be flown at half-staff until sunset July 19.
To fly the flag at half-staff, hoist the flag to the peak for an instant and then lower it to the half-staff position. The flag should be raised to the peak again before it’s lowered for the day.
The Postal Service’s guidelines on U.S. flag display and maintenance have additional information.