The Medical Reserve Corps (MRC) is a national network of volunteers, organized locally to improve the health and safety of their communities. MRC volunteers include medical and public health professionals, as well as other community members without healthcare backgrounds. 

​MRC units engage these volunteers to strengthen public health, improve emergency response capabilities, and build community resiliency. They prepare for and respond to natural disasters, such as wildfires, hurricanes, and floods, as well as other emergencies affecting public health, such as disease outbreaks.

​Nassau County MRC was founded by Nassau County Emergency Management in 2020.