The Gulf Cooperation Council (GCC) is an organization which has provided both cooperation between the Gulf countries but also division and crisis. The latest of these crises started in June 2017 and this report is aiming to examine how the latest of crises has affected the security cooperation within the GCC but also how the security cooperation was before the crisis and how the changes in cooperation can be explained. The report use two different theories to answer these questions. Although the Gulf crisis of 2017 has had effects on the security policy cooperation, this isn’t a new phenomenon for the organization. The GCC has had disagreements within the cooperation since the start and this has followed their work through the years with major effects during difficult and uncertain times such as the Arab spring of 2011. These disagreements have also led to crises in the past, but they have been resolved due to outer threats towards the GCC such as the strengthened position of IS in 2014. The Gulf crisis of 2017 has had its’ effects on the GCC:s security cooperation for example in terms of canceled military exercises with the US. However, the organization’s work within the field of anti-terrorism is still ongoing inspite of the current crisis.