Flag Day is a United States holiday that falls on June 14 and commemorates the day the American flag was officially adopted as a part of the country in 1777. The United States Army also uses this date to celebrate the army’s birthday since it is also the date Congress adopted the Continental Army in 1775. The week surrounding Flag Day is known as “National Flag Week” when American citizens are encourage to fly the flag. Having the flag in government buildings is a requirement. It is common practice to say the Pledge of Allegiance at events and sing the national anthem.