Patriot Day happens every year and is observed as the National Day of Service and Remembrance. It lands on September 11th of each year in memory of the 2,977 killed in the September 11th terrorist attacks in 2001. A bill to make a national day of mourning on September 11th was introduced in the U.S. House on October 25, 2001, but it wasn’t actually declared as Patriot Day until 2002. Today, the American flag is flown at half-staff at the White House as well as at all U.S. government buildings. It is also encouraged that American flags get hung on the houses of Americans throughout the country.