OMLT:s mission in Afghanistan was to develop the capability of afghan security forces. Previous researchers have concluded that a positive relationship between the two partners is the key to a successful mission. Still there is very little research on the topic of relationship development and researchers disagree on how to accomplish it in practice. The aim of this study is therefore to explain how Swedish personnel in OMLT build relationships with afghan security forces and the question this study aims to answer is: what tools can explain how Swedish personnel in OMLT built relationships with afghan security forces? To answer this question the study conducts a theory consuming case study with a qualitative content analysis by applying a theoretical framework developed from Hajjars theory of military adviser’s cultural toolkit on experience reports from Sweden´s participation in OMLT in Afghanistan. The results demonstrate that relationships were built intentionally by using intercultural competence and military competence and experience. In addition, by using combat skills and diplomacy tools the effect became relationship building although it may not have been the intended purpose.