(CNN) — Get ready to salute!
The U.S. observes Flag Day on Friday.
The first flag day was observed in Hartford, Connecticut on June 14th, 1861.
Then, in 1877, Congress ordered the flag be flown on public buildings on that date.
Later, in 1916, President Woodrow Wilson issued a proclamation asking the U.S. to observe Flag Day.
And finally, in 1949, congress - in a joint resolution - agreed to an official flag day and President Harry Truman approved.