This study aims to analyze the role of Pancasila and Citizenship Education (PPKn) teachers in implementing the third Pancasila value, namely the Unity of Indonesia, to instill a sense of national defense in grade X students of SMA Negeri 2 Pangkatan. The study used a descriptive qualitative approach with data collection techniques through observation, interviews, and documentation involving PPKn teachers, principals, and students. The results of the study indicate that PPKn teachers have an important role as educators, role models, and facilitators in internalizing the values ??of unity and the attitude of national defense through contextual learning, national activities at school, and the habituation of nationalist attitudes. Despite facing obstacles such as low awareness of some students, the influence of digital culture, and limited time and learning resources, teachers continue to strive to instill the value of unity through various learning strategies and school activities. This study provides a scientific contribution by showing that internalizing the value of Unity of Indonesia in PPKn learning can strengthen students' national character through the integration of classroom learning and school culture.
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