Armstrong Ambulance Service 70 Union St, Medford, MA02155 Armstrong Ambulance Service is an emergency ambulance dispatch created by Bill Armstrong. The operation houses more than…More 90 vehicles and tracks them with GPS navigation monitor systems. On board each vehicle, paramedics use first-aid medical equipment including cardiac monitors, ventilators and infusion pumps. The service also provides transportation services for the elderly, dialysis patients and obese individuals over 650 pounds. Call the dispatch number listed only when in need of an ambulance.