The genesis of the Battlefield Atmospherics Conference (BAC) was the analysis of the 1973 Israeli War and the effective use of smoke by the Israeli forces to defeat electro-optical systems. On March 16, 1978, Dr. William Perry, then the Under-Secretary of Defense for Research and Engineering, sent a memorandum to the Services giving the initial DoD plan for Atmospheric Transmission Research and Development. The Army was assigned tasks to: (1) Measure and model atmospheric propagation conditions for battlefield conditions; (2) Develop models describing natural and man-made dust, smoke, and chemicals and their propagation characteristics; and (3) Develop battlefield diffusion models to relate propagation conditions to meteorology. The Electro-Optical Systems Atmospheric Effects Library (EOSAEL) was developed in response to this tasking, and EOSAEL Conferences were held annually beginning in 1980. With the increased use of computers by FORSCOM in their MICROFIX program, the Corps of Engineers in their Air land Battlefield Environment Program, Tactical Weather intelligence (TWI) was conceived to provide automated decision aids for Commanders and their staffs. The annual conference became the EOSAEL/TWI Conference. The conference continued to grow in breadth of subject matter and number of attendees. In 1991, in an effort to encompass additional aspects of battlefield atmospheric effects such as acoustic transmission, the conference became known as the Battlefield Atmospherics Conference. This year the conference will be held at the White Sands Missile Range.