Heat Exhaustion and Heat Stroke Among Active Component Members of the U.S. Armed Forces, 2018-2022.

The most serious types of heat illness, heat exhaustion and heat stroke, are occupational hazards of the military's training and operational environments. These conditions can be mitigated with appropriate situational aware-ness and effective countermeasures. In 2022, the crude incidence rates of heat stroke and heat exhaustion among active component service members were 32.1 and 147.7 per 100,000 person-years, respectively. The rates of incident heat stroke and heat exhaustion generally declined during the 2018 to 2022 surveillance period. In 2022, those at highest risk were men, those younger than age 20, Marine Corps and Army members, recruit trainees, and those in combat-specific occupations. Leaders, training cadres, and supporting medical personnel must inform their supervised and supported service members of heat illness risks, preventive measures, early signs and symptoms, and first-responder actions.