The advent of expert systems has led to the development of advanced computer systems in areas of medicine, geology, mathematics, chemistry, vision, speech and electronics. The recent acceptance of artificial intelligence as an appropriate technology for military applications has evolved into the development of a number of defense related expert systems. This paper reviews several military applications of expert systems in the areas of advanced visual target recognition, autonomous tactical vehicles, and combat pilot aid systems. System concepts for these areas are described. Several references are provided for each. A number of other military applications of expert systems are discussed through the paper.