Franklin Co. officials warn of large gas leak near the Arnold Engineering Development Complex Police Lights and last updated 2021-07-23 23:47:46-04 TULLAHOMA, Tenn. (WTVF) â The Franklin County Sheriffâs Office urged drivers to avoid the area of Arnold Engineering Development Complex at the Arnold Air Force Base due to a major gas leak. Officials said Friday night that the gas formed a cloud over the AEDC area. Emergency Management officials responded and tried to contain the situation. Anyone noticing a change or shift in the noticeable cloud was asked to notify the authorities to help in a timely response.