Abstract: This study aims to assess the effectiveness of the TSL (Thank you, Sorry, and Love) program in enhancing the adaptability of military children in the Republic of Korea. A total of 30 military children were selected as participants and assigned to three groups: an experimental group receiving the TSL program, a comparison group receiving a resilience program, and a control group. Measures of adaptability (including resilience, perceived stress, depression, family function, and school adaptation) were administered to the military children at pre, post, and follow-up stages. The results reveal significant differences in adaptability between the TSL program participants and the other groups' participants at the post-intervention and follow-up assessments. These findings suggest that the TSL program has the potential to effectively enhance the adaptability of military children and maintain their adaptive capacities across various domains in the long term.