This from Mike Summa:

Hello,
This is Alsip’s 1965? ALF pumper.  Unknown specs.  What I do like about it is the light on the roof.  Didn’t Chicago have lights like this?  What was the name of this light unit?  Enjoy, and comment if you’d like.
–Mike Summa
Alsip Fire Department American LaFrance fire engine

Mike Summa photo