Final answer:
The assignment of an ISO at a hazmat technician level incident is mandated by National standards.
Step-by-step explanation:
The assignment of an ISO (Incident Safety Officer) at a hazmat technician level incident is not discretionary; it is mandated by National standards.
The National Fire Protection Association (NFPA) has developed a series of standards, including NFPA 472, that outline the requirements for hazmat technicians, including the presence of an ISO. These standards are intended to ensure the safety of responders and the effective management of hazmat incidents.
An ISO plays a crucial role at hazmat incidents by monitoring the safety of the operation, providing strategic advice to incident command, and helping to prevent or mitigate potential hazards.