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The French Air and Space Force operates the Constantin RozanoffMont-de-Marsan Air Base about 2 kilometres north of the town. The base includes CEAM (the French air force military experimentation and trials organisation), an air defense radar command reporting centre and an air defence control training site. Mont-de-Marsan Air Base was formerly home to France's first operational squadron of nuclear bombers, the Dassault Mirage IVA.
Stade Montois Club Omnisports is the city's main sports club: Stade Montois rugby and Stade Montois football are especially well-known. The city has around 9,000 sports licensees, which represents nearly 30% of its total population.
Two historic punk rock music festivals were held in Mont-de-Marsan's bullring in 1976 and 1977.
The Festival Arte Flamenco international festival was established 1989 in Mont-de-Marsan by the council of the Landes department and is the largest Flamenco festival outside of Spain.