Interstingly it is the same in german, you would say "Er ist Arzt" not "Er ist ein Arzt". Which makes me wonder why english uses an indefinite article there, since it doesn't seem to be either germanic or romantic in origin.

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1-more 3 hours ago | parent [-]

This was the root of the overblown Kennedy gaffe where he said “ich bin ein Berliner” instead of “ich bin berliner.”

	▲	arlcode 2 hours ago \| parent [-]
		The thing is that doesn't even sound wrong and I don't think any native speaker would object to the article when used with a place of origin/belonging in a speech. It emphasizes the statement if you ask me. Only many years after learning of the speech I read online that it's allegedly "a gaffe".