What type of training is NOT required for volunteers not acting in a response role?

Volunteers who are not acting in a response role are not required to undergo any formal training, which makes the answer "No training is required" correct. This indicates that if individuals are there merely to support or assist in non-hazardous activities unrelated to direct response operations, they do not need to complete specialized training programs.

In contrast, basic safety training is generally important for everyone involved in any capacity to ensure they understand safety protocols, while HAZWOPER training and environmental monitoring training are specifically geared towards those who will actively engage in environmental hazard response or monitoring activities. Thus, these forms of training are necessary for individuals who might be exposed to potentially hazardous materials or settings or who need to conduct ecological assessments. However, since the question focuses on volunteers who are not participating in response roles, the requirement for training is waived entirely in their case.