I don't know. Growing up I was told to stand respectfully for the National Anthem (men with caps off if outside at a baseball game), and to place my hand over my heart for the Pledge. When did the hand over heart for the national anthem start being the official way to behave?
I have to agree with that. That’s what I recall .
I agree, we always stood straight, hands at side or behind us. I don’t remember ever placing hand over heart.