Hexagone Balard is the headquarters of the French Armed Forces and the Ministry of the Armed Forces. Inaugurated in 2015, more than 9,300 personnel from the French Army, French Navy, French Air and Space Force and Direction générale de l'armement have moved into this 165,000 m2 (1,780,000 sq ft) white opaque glass-fronted building, on 41 acres (17 ha), from previously separate headquarters for each service branch. It cost 4.2 billion euro.