The Swedish Armed Forces had until relatively recently the alignment to act as an international peace keeping force by supporting other actors when promoting peace and freedom. Then the focus was to strive for military interoperability in that context. Now the alignment has shifted to the focus on defense of the national territory. A task that have been given the Swedish Armed Forces is to be able to do so together with other military forces including members of the North Atlantic Treaty Organization. This analysis seeks to answer how the military interoperability between the Swedish Armed Forces and the North Atlantic Treaty Organization is today in the context of joint multinational operations with the purpose to defend the national territory of Sweden. The result of this analysis shows that the Swedish Armed Forces and the North Atlantic Treaty Organization have achieved military interoperability in some respects but there is an absence of this in other respects. One of the prime conclusions of this analysis is that more research should be done in this area to get a clearer apprehension about how the military interoperability look between these actors and how it can be improved in the context of joint multinational operations with the purpose to defend the national territory of Sweden.