The Medical Reserve Corps is the component of the Citizen Corps that brings together local health professionals and others with relevant health-related skills to volunteer in their community.
The Medical Reserve Corps provides health professionals and others an organized mechanism through which they can volunteer their time and skills to strengthen their communities by preparing for and responding to large-scale emergencies and disasters, such as an influenza epidemic, chemical release or act of terrorism.

The Polk County Medical Reserve Corps (PCMRC) unit is intended to supplement the resources of the local public health and emergency management infrastructure in the event of a large-scale emergency or disaster.
Volunteers work under the direction of the Polk County Health Department. The Polk County Medical Reserve Corps conducts licensure verification as needed to ensure that selected members are qualified to provide care to the public.