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Existing literature features no academic research on social capital in the security environment. However, social capital is relevant for the current global security context because it has the capability of building cooperation based on trust and shared values. This project defines social capital in the global security context as the social and professional networks - based on shared experience, norms and values, and mutual trust - that facilitate cooperation of security professionals for future benefits. This research explores how, whether and the extent to which international education at the George C. Marshall European Center for Security Studies (MC) develops social capital among international security professionals. Using qualitative and quantitative methods, this study found that international education and shared experiences at the MC 1) foster social and professional networks that are used as capital to increase inter-agency and international cooperation; 2) facilitate the development of interpersonal and category-based trust; 3) contribute to participants’ awareness of and adherence to democratic values and norms; 4) increase intercultural communication and competence and 5) result in the application of acquired values, norms, and practices in the home countries of participants.