Had them since around 1995 maybe? They previously called them AFRAs. This was found in google:
MCFRS’ new ALS service
delivery model involving the use of alternatively-staffed medic units and increased use of
ALS first-responder apparatus (AFRA). The department’s intent is to implement the “1
and 1” ALS deployment model incrementally, whereby minimum staffing composition of
medic units is changed from two paramedics to one paramedic and one Emergency
Medical Technician (EMT) - typically a firefighter. The second paramedic position on
existing medic units would be reassigned to serve as the fourth position (i.e., firefighterparamedic) on an engine (or in one case on an aerial unit) at the same station as the medic
unit, thus creating an AFRA in addition to the medic unit. The AFRA would typically
respond along with that station’s medic unit, or another available medic unit, to ALS
incidents. This ALS delivery model would provide for the collective response of two
paramedics and four EMTs (between the AFRA and medic unit), thus increasing the
effectiveness of ALS patient care while also meeting NFPA Standard 1710 staffing
requirements for engines with regard to fire suppression.