NYPD calls its quick responders the E.S.U.; L.A. calls its squad this 4-letter acronym
ESU is always on patrol (all three 
tours, 365 days a year) with 10 Heavy Rescue trucks, each ordinarily manned by
... [DOC] [TLE] Emergency Service Unit - Wikipedia [PAR] An Emergency Service Unit (ESU) is a multi-faceted and multi-talented element 
within the ...