BLS Basic Life Support  
  ALS Advanced Life Support  
  MCI Multiple Casualty Incident  
  Medical Aid - A Level Non-Emergency Medical  
  One Engine or Quint Quint is a truck that can also pump water. This dispatch is used for various emergencies; ex. to investigate, or fight small non-structural fires.
  Medical Emergencies and Vehicle Accidents may be denoted with letter codes ranging from A to D .
A signifies the least serious and D the most serious emergency or accident.
 
Airport Emergencies range from Alarm 1 (A1) to Alarm 7 (A7)
A1   On Ground Mechanical or Emergency
A2   In Flight Mechanical or Emergency
A3   Fire or Crash
A4   Bomb on a Flight
A5   Bomb in an Airport
A6   Hijack Situation
A7   Structure Fire at Airport

 
 
Haz-Mat or Hazardous Materials Emergencies
Level I     Fuel spills of less than 25 gallons
Level IF   Chemical odors or natural gas line leaks with lines 4 inches or smaller
Level IP   Level I or Level IF with victims/patients
Level II    Chemicals other than fuel, or quantities of fuel greater than 25 gallons
Level III   Ex. Train derailment/accident/and possibly fire