US POW/MIA Recognition Day
US POW/MIA Recognition Day is held on September 18. Celebrated on the third Friday in September. This event in the second decade of the month September is annual. 
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POW/MIA Recognition Day is commemorated on the third Friday of every September, a date that's not associated with any particular war. In 1979, Congress and the president passed resolutions making it official after the families of the more than 2,500 Vietnam War POW/MIAs pushed for full accountability.
For every POW/MIA Recognition Day since 1982, the flag has flown just below the stars and stripes at the White House – the only other flag to ever do so. In 1998, Congress ordered it to also be displayed on Armed Forces Day, Memorial Day, Flag Day, Independence Day and Veterans Day.
Since World War I, almost 285,000 Americans have been taken as Prisoners of War, according to a Congressional report. The remains of almost 82,000 Americans are still missing, according to the Defense POW/MIA Accounting Agency.
Similar holidays and events, festivals and interesting facts
National Apple Dumpling Day and National Monte Cristo Sandwich Day in USA on September 17
Celebrate Freedom Week in US on September 17 (is a week designed to emphasize the teaching of the country's origins with an emphasis on the founding documents);
National HIV/AIDS and Aging Awareness Day on September 18 (The Centers for Disease Control and Prevention (CDC) reports that people aged 55 and older accounted for 26% of the estimated 1.2 million people living with diagnosed or undiagnosed HIV infection in the United States in 2013);
National Cheeseburger Day in USA on September 18
German-American Steuben Parade on September 19 (United States, especially New York City; celebrated on the third Saturday in September);
Cheese Days in Monroe, Wisconsin on September 19 (The weekend long event typically occurs on the third weekend in September of even-numbered years in the historic downtown area known as “the Square”);
National Butterscotch Pudding Day in USA on September 19