Code names for activities nationwide

I work at a local hospital and we have emergency response codes. I think this should be standardized nationwide. Example in our hospital we have a CODE SILVER: active shooter/killer. I have a friend who works at the air base clinic in Bellevue and their code name is CODE BLACK. Now there is a TV show stating that CODE BLACK is when an ER department is overwhelmed. If we use these codes as emergencies they should be standardized to help stem the confusion.