Within the last year, the Naval Postgraduate School has been investigating the feasibility of using voice recognition technology as a possible input methodology to the Army's tactical fire direction system, TACFIRE. A major reason behind considering voice data entry was the desire to increase the speed and accuracy in which data could be entered into the system. In order to evaluate the effectiveness of voice data entry to TACFIRE, the speed and accuracy advantages of voice recognition technology had to be weighted against numerous performance characteristics of available state of the art recognition equipment. One such performance factor was vocabulary size limitation. This report analyzes the vocabulary requirements needed to operate the Artillery Control Console from a Division artillery display group shelter. It also presents the suggested vocabulary organization within the constraints of a specific recognizer which tested to be best suited for the TACFIRE environment. (Author)