Whenever we are dealing with noise propagation at distances greater than 100 m from the source, there are many factors affecting the propagation. For weapons firing, a major factor affecting propagation is the tendency of terrain to diffract and deflect the sound. A computer program has been written in TurboPASCALto run on an IBM‐XT computer. The program consists of digitized terrain data for a specific area along with a predictive sound propagation model for 25‐ and 7.62‐mm guns along with the TOW anti‐tank missile. The user selects locations of firing point, target point, and observer, along with number of rounds fired, and the start and end time of firing. The computer program provides the A‐weighted day‐night average sound level at the observer's location. The significant feature ofNOISE.PASis that it computes excess attenuation caused by terrain for specific sites. Additionally,NOISE.PAStakes the tedium out of doing sound calculations, which incorporate excess attenuation caused by terrain, for weapons firing.