Many colleges and universities now also have their own EMS agencies. Collegiate EMS programs vary somewhat from university to university; however, most agencies are fully staffed by student volunteers. Agencies might operate what is called a Quick Response Service (which does not transport patients but acts as a first responder to scenes) providing initial patient assessment and care, or they might operate certified ambulance services staffed with EMTs or Paramedics. Some groups limit services to within their campus, while others extend services to the surrounding community. Services provided by college and university agencies may include ambulance services, mass-casualty incident response, aero-medical services, and search-and-rescue teams.