There is a list of countries (Iran and friends, I'm not sure if China was on the list) that if you have or had ever previously held citizenship you are permanen

There is a list of countries (Iran and friends, I'm not sure if China was on the list) that if you have or had ever previously held citizenship you are permanently barred from working with ITAR controlled materiel. The reason being that otherwise there's nothing stopping you from renouncing your citizenship, stealing the secrets, and defecting in exchange for being granted citizenship again.