Postal facilities that are open are required to fly the POW-MIA flag on May 21.
May 21 is Armed Forces Day, one of six days each year that Postal Service facilities are required to fly the POW-MIA flag.
The flag honors the sacrifices made by members of the armed forces held as prisoners of war or listed as missing in action.
Facilities that are open Saturday must display the POW-MIA flag, which honors the sacrifices made by members of the armed forces held as prisoners of war or listed as missing in action.
The POW-MIA flag must fly below the U.S. flag.
For additional information, read the Postal Service’s guidelines on U.S. flag display and maintenance, as well as requirements for displaying the POW-MIA flag.
Source: USPS News Link