The contribution is based on the continuous (partial) results of the investigation into voice quality, which is the author’s long-term research interest. The vocal quality remains an important factor of the service performance of the professional military personnel even in the 21st century. The voice of a military professional should be both naturally resistant and well trained in order to avoid the development of voice disorders due to heavy strain typical for the military service communication. It is proved, that a good vocal quality decisively helps to ensure the intelligibility of commands and facilitates the perception of the transmitted information.