Since 1969, Environmental Tectonics Corporation's subsidiaries and strategic business units have been serving a variety of markets which are separated in two distinct categories; The Training Services Group (TSG) includes all training products or services for the aviation, space, mass entertainment and emergency response markets. The Control Systems Group (CSG) provides an array of products that are designed and manufactured in-house to meet the requirements of the HVAC/engine development, clinical medicine, pharmaceutical and animal care markets.