PROVISION OF FIXED WING AIR AND GROUND AMBULANCE SERVICES TO PORTIONS OF THE RIO GRANDE VALLEY OF TEXAS PRIMARILY INCLUDING COMMUNITIES AND UNINCORPORATED AREAS IN CAMERON COUNTY. FOUNDATION HAS CONTRACTS TO PROVIDE AMBULANCE TRANSPORT AND EMERGENCY MEDICAL SERVICES IN THE CITIES AND TOWNS OF HARLINGEN, LA FERIA, PALM VALLEY, PRIMERA, RIO HONDO, SANTA ROSA, SAN BENITO AND COMBES AS WELL AS THE UNINCORPORATED AREAS OF CAMERON COUNTY INCLUDED IN ZONES 2 AND 4 ON THE CAMERON COUNTY EMERGENCY SERVICES DISTRICT NO. 1'S OFFICIAL AMBULANCE SERVICE ZONE MAP.