National Anthem etiquette

[Domehead]

Meaningless opinion to follow...

I carry the Saltire for the Society and the Robertson Red for the Clan:
When carrying the Saltire, I always dip the Saltire for all anthems - as many as four - in the presence of the American Colors or Flag. Head gear stays on.
When carrying the Robertson Red, I martial the banner left arms and stand attentively for all anthems until the American anthem when I place my hand on heart.
On the very rare occasions I am but marching, I stand attentively through all anthems until the American anthem when I remove my bonnet and place hand on heart.

For the record, I did eight years in the US Army and none of my personal observances may relate.