Sept. 20 is Recognition Day for service members who are still listed as missing in action and prisoners of war in Vietnam and Southeast Asia. This day is observed yearly on the third Friday of September.
The design for the flag was created by Newton Heisley in 1972. He was asked to create an awareness flag by The League of Families of Americans who were prisoners of war or missing in action in Southeast Asia.
Congress formally adopted the flag as a promise to show its commitment to bringing all military service members home. The U.S. still continues to occasionally receive the remains of servicemen from Southeast Asia.