Environmental conditions can be predictably extreme and severe, such as deserts, polar, alpine regions and deep oceans. However, even under normal habitat conditions, individuals may be exposed to transient, life-threatening extreme conditions due to daily work activities.

In the current sociological context, the loss of the lives of operatives who carry out activities in extreme environments is poorly accepted by public opinion, namely when we live in the era of the industrial revolution 4.0. In this context, the absence of integrated systems to monitor the physiological status in real time of operational personnel in training and / or missions is incomprehensible, due to a public opinion that is increasingly well informed about the technologically existing solutions available to most consumers.

CBRN military personnel are exposed to extreme working conditions, due not only to the dangerous nature of the work (permissive, uncertain and hostile environments), but also to the characteristic of protective clothing, which causes a rapid and dangerous rise in vital physiological parameters in hot climates up to 45 ° C. Thus, real-time monitoring of the physiological status of these military personnel is very important to ensure the readiness of individual and team performance.

CBRN operations and reconnaissance are missions of high thermal stress, particularly in environments where the external temperature is high, due to the operational  CBRN protective suits, which make normal human thermal regulation impossible. The armed forces can be engaged in a wide range of contexts, from war to supporting civilian populations, namely in disasters or in emergencies with low probability of occurrence, but with a high severity of social impact, such as CBRN emergencies, like the one we are facing  with COVID19.

CBRN threats are very dangerous to human life and rapid remediation actions are crucial to saving lives after an incident has occurred. Mitigation responses are generally made using human operators in extreme risk scenarios for human life, which require high security procedures. The response process generally includes: recognition of the affected area, initial detection of the agent, sample collection, decontamination, first aid, medical evacuation, among others. One of the points common to all stages of the response process is the use of personal protective equipment, that is, facts that constitute themselves as an adverse environment to the proper functioning of human physiological systems.