Dec. 7 is National Pearl Harbor Remembrance Day, an annual commemoration of the attack on Pearl Harbor in 1941.
Postal Service facilities are required to fly the U.S. flag at half-staff Dec. 7.
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.
For additional information, refer to the Postal Service’s online guidelines on U.S. flag display and maintenance.