The National League of Families POW/MIA flag, often referred to as the POW/MIA flag, was adopted in 1972 and consists of the official emblem of the National League of Families of American Prisoners and Missing in Southeast Asia in white on a black background. In 2019 the National POW/MIA Flag Act was signed into law, requiring the POW/MIA flag to be flown on certain federal properties, including the U.S. Capitol Building, on all days the U.S. flag is flown.