- "None can stand against the Valahia. Bring the full force of the "Orgoi" against them!"
- ― Valahia Commander
Capital Defense is the fifth campaign mission in Ace Combat: Joint Assault. The Valahia are attacking Tokyo again, and the player must destroy the large aircraft they've deployed to lead the offensive.
Burford: Scramble, men! The Valahia have invaded Tokyo airspace again. They've also unveiled a new beast of an aircraft, which is a huge threat to Tokyo and the SDF. You will each be sent coded intel on this weapon. Take it out and halt enemy progress. Rigel Squadron, Antares Squadron. Head out immediately.
Clear the mission under 4 minutes 30 seconds. This applies to both mission 5A and 5B.
- AH-64 Jolly (Mission 5A) - appears at the lower half of the map, after the Orgoi's weapons have been destroyed four times.
- MiG-21-93 Balalaika (Mission 5B) - appears at the lower half of the map, after the Orgoi's weapons have been destroyed three times.
Burford: The enemy weapon was shot down, preventing any further damage to the Tokyo area. My apologies for what happened with Rigel Squadron. As their commander, I have no one to blame but myself. In light of this attack, the international community is calling worldwide anti-Valahia measures. I'm sure they will call on us, but after what happened here I'm not sure how we will be received. We have to restore our good name! I'm counting on you!