in the arenas of medical first respondent or EMT training/certification, fire suppression, vehicle and machinery victim extrication, swift water rescue, structural collapse rescue, high and low-angle tactical rope rescue, confined space rescue, trench rescue and water rescue. ESU members' tactical SWAT training includes the use of irritant chemical agents, HAZMAT personal protective equipment (PPE), victim technical rescue equipment, forcible entry techniques, elevator rescue, HAZMAT detection instruments, HAZMAT decontamination, dangerous animal and reptile management, defensive electronic immobilization shields, barricade response, tactical formations, and the use of a myriad of both semi-automatic and fully automatic firearms. ESU members are usually cross-trained and maintain both State and National certifications as a Medical First Responder, Emergency Medical Technician (EMT) or Paramedic and sometimes as a Psychological Services Technician (PST). ESU members may also be trained at the National Firefighter 1 level to provide initial response and fire suppression within massive and highly populated fixed structural locations. Equipment ESU equipment can include: vehicle extrication tools, high-angle and low-angle rope and victim rescue equipment, SCUBA, forcible entry tools, lighting equipment, irritant chemical agents, HAZMAT detection instruments, HAZMAT PPE, HAZMAT decontamination, pneumatic breaching tools, self-contained breathing apparatus (SCBA), water rescue gear, animal control tools, semi- and fully automatic firearms, and ballistic gear, portable cutting and hand tools, high-energy hydraulic rescue tools, metal detectors, climbing gear, body bunker ballistic shields, portable field lighting, small marine craft, fire-fighter protective clothing, ballistic body armor and shields, basic life support (BLS) or advanced life support (ALS) equipment, as well as additional medical equipment. Response vehicles ESU utilizes smaller patrol response vehicles which are supported by larger utility "rescue squad" type trucks. Smaller patrol ESU response vehicles can range from an SUV to a light or medium duty truck or van with a rear-mounted utility body. Larger ESU vehicles can range from a medium duty chassis to a heavy duty "squad" utility body mounted on a commercial chassis. Other ESU support vehicles can include one or more ambulances, wheeled or tracked armored vehicle, portable light towers/generators up to 100 kW, emergency support vehicles which contain inflatable marine watercraft or massive inflatable airbags. Non-law enforcement ESUs ESUs also exist as a non-law enforcement agency based municipal, county or non-government entity and may exist as both career and volunteer groups which are located in urban, rural and remote areas. Non-law enforcement ESUs provide temporary emergency response to incidents during major public events to support