The purpose of this science project was to see if sound waves could be used to identify different weapon systems. When processing signals, such as sound waves, Fourier analysis can isolate individual components of a compound waveform, concentrating them for easier detection. The procedure was to record a weapon system’s sound wave with a digital sound recorder. The digital signal was transferred to a computer using a usb cable. The sound wave file was converted from mp3 format to wav format using the AVS file converter program. The digital signal was read into the MATLAB program and displayed. The spectrogram function was used to perform the Discrete Fourier Transform on the signal. The plot function was used to plot the graph. Data analysis consisted of analyzing the spectral analysis graphs and comparing them to see if each different weapon system had a unique output. The decibel levels for the weapon systems were each compared at the same frequencies. The conclusion was that each different weapon system had a unique spectral graph. Therefore, different weapon systems can be identified by using their unique Discrete Fourier Transform output signals.