We greet superior officers, pay homage to the American flag, and show respect to fallen comrades by rendering the powerful, non-verbal gesture known as the hand salute.
Though there's no real written record of how or where the worldwide tradition started, saluting dates back in history to a time when troops would raise their right hand (their weapon hand) as a signal of friendship.
Today, recruits learn how to properly hand salute in boot camp and demonstrate the act countless times before heading out to active service. After a while, muscle memory kicks in and the gesture becomes second nature. But many civilians use the salute as a form of celebration — and they get it so, so wrong.