The defense industry has large numbers of such jobs. Of course, that means having to deal with all the crap that comes with government contractors.
At a major defense contractor years ago, and in defense-specific departments (unclassified roles), my group of 10 had:
- a Cuban-born (immigrated as a child) who never renounced;
- a Kuwait-born (same). (and her Iraq-born brother was in a parallel department)
- a Taiwan-born, not sure when she immigrated
- and the project leader was China-born (pre-revolution)
Now, I can imagine that in higher-security roles, things could be stricter, but I've never seen a public job listing that said dual-citizenship was a deal-breaker.