At  2:35pm RVFD was alerted to assist RVFD EMS with a subject that had fallen from a horse.  RVFD EMS and CCDES PM-17 were on location at 23676 Seward Road and had requested MSP Aviation for a patient who meant the criteria as Category "B", Priority-2 Trauma patient.  Chief-4 (Utz) checked up on the air and advised all units that the landing site would be established at the Ridgely Airpark on Race Track Road.  MSP Trooper-6 arrived and transported the patient to Shock Trauma with a RVFD EMS LT. Barbie Utz aboard for assistance.