Diapason is a mission in Ace Combat Zero: The Belkan War.
Directus is divided into five administrative wards centring on the River Crescere. Powerful Weapons have been place in each ward, comprising the Belkan's army Ustio - branch headquarters. This battle will determinate our fate, as the annihilation of all enemy forces will mean liberation for the nation of Ustio. The enemy forces are primarily comprised of ground troops, but we have received information that, while not yet confirmed, there is also a squadron of hi-tech enemy fighters. Your orders are to destroy the Belkan forces and liberate Directus. We can't afford to lose.