CV-04 Fort Grace

The CV-04 Fort Grace is a Kitty Hawk-class aircraft carrier belonging to the maritime arm of the Independent State Allied Forces, and is the only known ISAF carrier to appear in Ace Combat 04: Shattered Skies.

The carrier is seen in the intro to Sitting Duck, where player character Mobius One of the 118th Tactical Fighter Wing is seen taking off from.

The Fort Grace is never named as such in-game; it's only referred to as such as in the official ACECOMBAT04 site.