Aims. Job stress undermines effective performance as well as mental health among military personnel. The present study was conducted to verify job stress affecting military personnel. Methods. The subjects (49 females, 195 males and 8 not identified) were selected randomly. The questionnaires were composed of: 1) the Osipow Job Tension Questionnaire, 2) a research-made scale regarding aviation stress and 3) a job satisfaction questionnaire. The validity and reliability of the scales were confirmed in a pilot study. Results. Results revealed that 67% of the personnel suffered from a high level of stress and that 11% of them also showed severe stress levels. We also found that work stress was significantly associated with family and career stress. Furthermore, the results showed that 56% of the subjects showed stress on Responsibility subscale and 32% had stress on Role Boundary subscale. 50% of the subjects had high levels of tension, and 29% showed medium levels. 62% of the participants showed a moderate level on job satisfaction. Conclusion. It can be concluded that job stress is more effective than life-related stress in increasing stress levels among military personnel. Moreover, the study demonstrated that role stress in work is one of the main components of causing stress among military personnel. Finally, it was found that there was a negative and significant association between the job satisfaction and work stress. These results are supported by previous studies.