LA Fire Department "Class 1"?

My first job after I left academe was as a writer with the LA City statistical bureau. In that job, I worked a lot with the fire department, and one of the first things I learned was that LAFD is a "Class 1" department. Its apparatus proudly carried, and in fact still carries, a "Class 1" designation, as you can see in the photo above (click on the image for a better view). Here's an explanation of what the ISO "Class 1" means : ISO stands for Insurance Services Office (ISO), which is an independent, for-profit organization. The ISO scores fire departments on how they are doing against its organization’s standards to determine property insurance costs. After analyzing the data it collects, the ISO assigns a Public Protection Classification (PPC) on a scale from 1 to 10. The higher the ISO fire protection class (with Class 1 being the best), the “better” the department – at least in the eyes of the ISO. To determine ISO rating for fire depa...