Aim: To study the dynamics of stress symptoms manifestation in police officers of different ages before and after performing their service and combat missions of varying duration. Materials and Methods: The research, conducted in 2024-2025, involved 71 Master’s-level student officers (officers) (male, up to 25 years old) from Odesa State University of Internal Affairs (OSUIA) and 103 serving officers of various ages (male, up to 30 and older) who are on staff at OSUIA in multiple positions. Research methods: theoretical analysis of literature sources, psycho-diagnostic methods, statistical methods. Results: The most pronounced manifestation of all stress symptoms was found in serving officers, regardless of age, after returning from their rotations last ing 3-4 months. After performing service and combat missions, the stress level (14.8-15.4 points) among serving officers of all age groups was significantl (p . 0.001) higher than among student officers (10.1 points). No significant differences were found between the stress levels of serving officers across differen age groups (p > 0.05), indicating that the level of stress does not depend on the age of law enforcement officers, but rather on the duration of their exposure to stressful conditions. Conclusions: The research indicates the need to develop stress resilience in law enforcement officers to ensure the effectiveness of their service and combat activities in conditions of martial law, as well as to develop skills in the use of available means for stress prevention in the process of prolonged service and combat activities to restore mental health indicators.