I had a discussion with a clan member the other day about protocol for clan flags at a highland games. During the American National Anthem some of the clans tilted their flags to horizonal and some did not. Also, when trooping by the American flag does the same apply? Does anyone know the accepted protocol for this and is it written anywhere? I've searched and can't find anything in writing on this. It always looks better to see a unified response during ceremonies and to follow protocol according to any heraldic or national codes of conduct appropriate to the situation.