In Luxembourg, founded in 1881, the Luxembourg Army is responsible for the defense of the country and fulfilling the Grand Duchy’s commitments to NATO, European security, and international peacekeeping, as well as providing support to civil authorities in the event of emergencies, such as floods or disease outbreaks; the Army is an active participant in EU, NATO, and UN missions and has contributed small numbers of troops to a number of multinational operations in parts of Africa, Europe, and Asia; it trains and exercises regularly with EU and NATO partners and has contributed to the NATO battlegroup forward deployed in Lithuania since 2017; Luxembourg was one of the original 12 countries to sign the North Atlantic Treaty (also known as the Washington Treaty) establishing NATO in 1949

in 2015, Belgium, the Netherlands, and Luxembourg signed an agreement to conduct joint air policing of their territories; under the agreement, which went into effect in January 2017, the Belgian and Dutch Air Forces trade responsibility for patrolling the skies over the three countries (2025)