Allied Joint Force Command (JFC) Brunssum is one of three headquarters in NATO at the operational-level, together with JFC Naples (Italy) and JFC Norfolk (United States). JFC Brunssum plans, executes and supports military operations within its assigned missions and tasks to deter and defend against all threats across all domains, in order to preserve freedom and security, national sovereignty and peace of NATO Members and Partners.

The United Kingdom, Canada, Germany and the United States are the framework nations for the robust NATO presence in Estonia, Latvia, Lithuania and Poland respectively. In response to Russia's invasion of Ukraine, at the extraordinary NATO Summit in Brussels on Mar. 24, 2022, Allied Heads of State and Government agreed to establish four more multinational battle groups in Slovakia, Hungary, Bulgaria and Romania. In these eight countries, small headquarters, called NATO Force Integration Units (NFIUs), are also established on a permanent basis in order to facilitate a rapid deployment of additional forces in the region if decided. NFIUs are working in conjunction with host nations to identify logistical networks, transportation nodes and supporting infrastructure in order to ensure that NATO high-readiness forces can deploy to an assigned region as quickly as possible. They support collective defence planning and assist in coordinating training and exercises. Six of these eight countries are in JFC Brunssum's area: Estonia, Hungary, Latvia, Lithuania, Poland, and Slovakia.