500
This is how the hand salute came about
What is The origin of the Hand Salute is uncertain. Some historians believe it began in late Roman times when assassinations were common. A citizen who wanted to see a public official had to approach with his right hand raised to show that he did not hold a weapon. Knights in armor raised visors with the right hand when meeting a comrade. By 1820, the motion was modified to touching the hat, and since then it has become the Hand Salute used today