In a time of crisis, the Joint Expeditionary Force (JEF) can employ a range of JEF Response Options (JROs) to provide a rapid, flexible and scalable response in support of regional security and stability. These options enable Participating Nations to act collectively across the spectrum of competition, crisis and conflict, ranging from enhanced intelligence sharing and strategic messaging through to military deployments on land, at sea, in the air and across the cyber domain. Because JROs are pre-developed and understood by all Participant Nations, they allow political and military leaders to respond quickly to emerging situations, demonstrating unity, reassurance and deterrence while maintaining the ability to tailor activities to the specific circumstances of a crisis.
Outside periods of crisis, the JEF uses a comprehensive programme of pre-planned exercises, training activities and operational engagement to strengthen readiness and improve multinational integration. These activities allow Participant Nations to practise command and control arrangements, test response options, refine procedures and enhance interoperability between forces across all domains. Regular exercising also helps build trust and understanding among Participating Nations, ensuring that personnel, headquarters and capabilities can work together effectively when required. By continuously training and learning together, the JEF improves its ability to coordinate rapid responses, adapt to emerging threats and deliver credible military effects whenever called upon.
Complementary to NATO
Although the JEF is separate to NATO, all JEF Participant Nations are NATO Allies and everything the JEF does is complementary to NATO by design.
The complementarity of JEF is grounded in NATO Article 3: In order more effectively to achieve the objectives of the Treaty, the Parties, separately and jointly, by means of continuous and effective self-help and mutual aid, will maintain and develop their individual and collective capacity to resist armed attack.
JEF Response Options (JROs)
Since the 2022 invasion of Ukraine, the JEF has gone through a period of ‘operationalisation’ by developing a catalogue of JEF Response Options (JROs). These options provide senior leaders a range of responses across the JEF Area of Interest within NATO Article 3. JROs are constantly refined to support the National Defence Plans of JEF Participant Nations and NATO’s Regional Plans North-West and Centre.