Do you salute a towns mayor?
Personally I do, as with other high offices. More for the office and the implied respect for the office.
Likewise, they are usually going to be the reviewing officer of similar so its a nice touch which doesn’t cost anything.
I tell my cadets (and staff if they ask) that no-one ever got sacked for saluting. Shows respect.
I always work on the basis of ‘if in doubt, promote’.
fewer people are going to be annoyed by being given respect they don’t deserve than the other way round.
In a similar vein, if you’re unsure where a North American is from guess Canada rather than USA.