Here are some acronyms to expand your knowledge!
SRVFPD: San Ramon Valley Fire Protection District, you know this...
ACFD: Alameda County Fire Department, Fire Department covering Alameda County, South of San Ramon Valley
CCCFPD: Contra Costa County Fire Protection District, Covering Contra Costa County, North of San Ramon Valley
Cal Fire: California Department of Forestry and Fire Protection, Provides fire protection statewide
SR: Single Role, Ambulance staffed only by Paramedics/EMTs, no firefighters
USAR: Urban Search and Rescue, Heavy Rescue, primarily used for rescues, extrication, etc.
REACH: REACH Air Medical Services, Helicopter Ambulances, remote rescues and critical condition patients
CHP: California Highway Patrol, California Statewide Police, Traffic Control, Aerial Support
AMR: American Medical Response, Private Ambulance Company
TAC: Tactical Radio Channel, Radio used during active incidents
BLS: Basic Life Support, Basic medical techniques, CPR, AED, Tourniquets, etc
ALS: Advanced Life Support, Advanced medical techniques, often used by paramedics
EMT: Emergency Medical Technicians, BLS trained in ambulances
EMS: Emergency Medical Services, Paramedics, EMTs, etc.
HAZMAT: Hazardous Materials, Materials that pose risks to humans and the enviorment
MCI: Mass Casualty Incident, An incident involving a large number of victims
MCU: Mass Casualty Unit, A specially designated unit for MCIs.
ELS: Emergency Lighting System, the emergency lights on Fire Engines, Ambulances, Police cars.