Please expand information about Ace Combat 6: Fires of Liberation.
Istas Fortress
From Ace Combat Wiki
Istas Fortress is a large Erusean stronghold in the mountains on the Tango Line, featured in Ace Combat 4: Shattered Skies. It is heavily defended by anti-aircraft weapons. In the mission Tango Line, ISAF forces launched an aerial assault on Istas Fortress and damaged it.
