The Joint External Evaluation Process (JEE), developed in response to the 2014 Global Health Security Agenda (GHSA), is a voluntary, independent process conducted by a team of external evaluators to assess a country's public health preparedness capabilities under the 2005 International Health Regulations (IHR) revision. Feedback from the JEE process is intended to aid in the development of national action plans by elucidating weaknesses in current preparedness and response capabilities.To identify gaps in sector participation and the development of national action plans in response to public health emergencies, all English-language JEE reports available on March 31, 2018 (N = 47) were systematically reviewed to determine sectoral backgrounds of key host country participants.Overall, strong representation was seen in the health, agriculture, domestic security, and environment sectors, whereas the energy/nuclear and defense sectors were largely under-represented.While strong participation by more traditional sectors such as health and agriculture is common in the JEE development process, involvement by the defense and energy/nuclear sectors in the JEE process could be increased, potentially improving preparedness and response to widespread public health emergencies.