As a budding emergency manager and working in EMS, we call NIMS "FEMA Speak" because there the only people who understand it! The language and symbology is close to the NATO symbology and what I learned in BNCOC

The weakness is that everyone involved including first responders and contract help is supposed to understand this...

The strength is ??? Hell I havent figured that out yet, but NIMS classes online are the definative cure for insomnia!