The IUN is an international organization on Strangereal.


By 1996, the IUN was involved in peacekeeping efforts during a standoff between FCU and Erusean forces in Ugellas and Amber. However, the FCU forces retreated on April 20, 1996 following the Ulysses 1994XF04 announcement; their retreat forced the IUN to also retreat. The IUN's retreat was notably hampered by logistical difficulties and heavy storms, preventing their retreat from fully taking place until April 22.[1]

Sometime following the Continental War, a group of Erusean rebels seized a military factory that was under the IUN's control.[2] The rebels, calling themselves Free Erusea, launched attacks across the Usean continent. The Independent State Allied Forces launched Operation Katina to quell the rebellion.[3]

After Operation Katina, ISAF squadrons–Mobius, Omega and Viper–were reformed as IUN squadrons.[4][5] In 2014, they would participate in Operation Gator Panic, where they were deployed against a resurgent Free Erusea.[6]

In 2019, the IUN played an unknown role in the Lighthouse War.[7]


  • The IUN plays a similar role to the United Nations in the real world.
  • The Neo United Nations also played a similar peacekeeping role. Since the IUN was introduced in Ace Combat 04 promotional material, it may have acted as a retcon for the Neo United Nations.


  1. Usea Today: Asteroid on Collision Course With Earth!
  2. ISAF Bulletin.
  3. Arcade Mode, Ace Combat 5: The Unsung War.
  4. File:Ace Combat 7 Skies Unknown - PGW 2017 PS VR.
  5. File:Ace Combat 7 Skies Unknown - PS4 VR Gameplay Trailer
  6. [TGS 2018]「エースコンバット7」VRモードの詳細を主要開発スタッフに聞く。「サマーレッスン」チームが挑んだ“本物のパイロット体験”とは
  7. File:Ace Combat 7 Skies Unknown - E3 2017 Trailer.
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