Oh. I don’t know if anyone has mentioned this, but code green is often used as an emergency code in hospitals. There’s no standard in the United States, but the Wikipedia article lists a few of them. Code green is used as the severe weather warning in a few Florida schools, the code for general evacuation in certain Canadian hospitals, and UnityPoint Health uses code green to indicate the presence of a combative person.
However, I find I am most interested in Texas Tech University Health Sciences Center’s interpretation of code green. In that hospital, it means “Internal disaster.”
Take that how you will.