wiki.radioreference.com
New Hampshire is not even using the APCO suggested ten codes. I've observed that both law enforcement and fire agencies in the east think locally and traditionally, with procedures rooted in the distant past. I watched a YouTube video one day where none of the units were using tactical designators, they were using their daily designators. So Battalion 7 remained that even though he was the Incident Commander (IC) and Battalion 3 was actually the Charlie Division Supervisor, which refers to the back of the building. The other divisions might have Batt Chiefs, but let's say a truck captain was division supervisor qualified, would the designator be "Captain 54" or some such? How are firefighters supposed to to keep the line of authority straight? What if non-local resources arrive on scene? The video showed the fire started to take off on them and the IC spoke into the radio with "Battalion 7, Alarm, strike the second box" or some such. If I was listening I would interpret that Alarm was calling BC7, since ICS also specifies the unit being called is always first, none of this "2150
TO Headquarters" stuff. Additionally what in the world does "Strike the Second Box" mean?
It was like this all over the country at one time. The Congress passed the so called "FIRESCOPE" law in 1971 or 1972. ICS was the result as that is the goal specifically stated in this law. I worked a large fire in California in 1980 where an early version of ICS was being used. The U.S. Forest Service made ICS mandatory by 1986. Both structural and wildland fire agencies adopted it a few years prior to that. It became mandatory for the NPS, BLM, USFWS and BIA instituted it around the same time. Federal law requires the use of ICS for mutual aid and I recall that being on the books in the late 1990's or early 2000's. I note that when watching YouTube that ICS seems to be used for daily incidents in the west and back to about the 100th meridian or maybe the Mississippi River. East of there a hodgepodge of terminology and command systems seem to be in use.
With the numbers of hurricanes, tornadoes and other disasters increasing, the use of national resources and ICS in eastern and southern states are going to be more frequent. It would seem that wise to make some changes to daily procedures.
Maybe my impression of eastern agencies is wrong. My travel east of the Mississippi River, as an adult, is limited to 3 trips in 1984, 1990 and 1996. My scanner listening time in the east is nearly zero. So what do eastern state residents observe. ICS is actually "federal lingo" in a manner of thinking, so this is still on topic.