This from Deputy Chief Drew Smith:
Here are a few pages from an old Prospect Heights log book. Many departments still keep a hand-written log book, but for whatever reason this practice was discontinued here by 1981. The first working fire entry is recorded by Captain Ron Olsen who was later promoted to deputy chief. He retired from that rank and continues to serve with the PHFD as a part-time fire inspector.
Chief Olsen also made the second entry. It has additional entries by Lieutenant Warren Lippert and Captain Norm Bittner. Lt. Lippert’s son is retired Arlington Heights firefighter Dean Lippert. Also, it appears that around November 1, 1971 is when the PHFD adopted the Code 1, 2, 3, 4 system used by many fire departments. I believe the origin of this can be attributed to the Elk Grove Village FD.