Osean Air Defense Force

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The Osean Air Defense Force (OADF), colloquially referred to as the Osean Air Force, is the aerial warfare service branch of the Osean Defense Forces. It is one of the largest air forces in the world and utilizes highly-advanced aircraft such as the ADF-01 FALKEN.

Known deployments include the Belkan War and Circum-Pacific War. More recently, it was deployed during the Lighthouse War.


Belkan War

The Osean Air Defense Force was known to have existed in its current name as early as 1990 when it established the Wizard Team[1], while the first known deployment occurred in 1995 during the Belkan War. Following Belka's expansion into neighboring territory on March 25, the Osean military formed an alliance with the Republic of Ustio and created the Allied Forces along with Yuktobania and Sapin.[2] They would participate in various operations throughout the war, most notably Operations Battle-Axe[3] and Cannibal.[4] Following the end of the war, the OADF would recruit a number of Belkan pilots into their ranks.[5]

Circum-Pacific War

In 2010, the OADF would once again see action during the Circum-Pacific War. The Air Force played an important role throughout the war, defending the Osean Federation from the initial attacks and later participating in the invasion of Yuktobania.[6] In particular, the Wardog Squadron became a major source for Osean Army's morale, gaining a reputation as the "Demons of Razgriz" following Operation Long Harpoon where they sank the Yuktobanian underwater submarine, Hrimfaxi, in the Razgriz Straits.[7] During the final hours of the war, several OADF squadrons would participate in the Battle of Sudentor, both assisting the Ghosts of Razgriz in making access to the SOLG's control facility and fighting against them, attempting to claim the SOLG's nuclear payload for themselves.

Lighthouse War

An OADF F-15C firing on Avril Mead's F-104C

In 2019, the Kingdom of Erusea declared war on the Osean Federation and once again, the OADF was deployed. At least two F-15C fighters from the Air Defense Force participated in the interception of Erusean MQ-99 drones targeting naval ports across mainland Osea, one of which shot down the F-104C piloted by Avril Mead,[8] and subsequently forced her to crash-land in an OADF base that was also destroyed by the drones.[9] Following the drone attacks, the Air Defense Force released a statement addressing the origin of these drones.[8]

Osean mechanics equipping an F-15E with a Tactical Laser System during the Lighthouse War

Throughout the Lighthouse War, units from the Air Defense Force would be deployed during various operations, either seconded to the IUN-PKF or independently as the Long Range Strategic Strike Group (LRSSG). The LRSSG played a critical role as the vanguards in a series of major campaigns for Osea and IUN forces, including operations against the submersible aviation cruiser Alicorn and the two Arsenal Birds.

However, the OADF was severely hampered after the global satellite networks were destroyed as a result of anti-satellite operations carried out by both Erusean and Osean fighters during Operation Giant's Step.[10] The loss of communications led to multiple friendly fire events, including the one after Operation Gorgon causing the death of General Édouard Labarthe, and also allowed the prisoners of an unnamed Osean penal unit to escape and attack former allies with stolen aircraft.[11]


The Osean Air Defense Force follows a traditional air force structure. It is divided into large groups, wings, which are then divided into smaller groups and squadrons. While the body responsible for commanding the force itself is the Osean Air Defense Force Central Command, OADF fighter squadrons, as well as fighter squadrons of Osean Maritime Defense Force during emergency situations, are under the jurisdiction of the Air Combat Commando group. The OADF also features smaller sub-divisions, including a Technology Development Bureau.[12]


8th Air Division

5th Fighter Wing

Other Squadrons

Assigned to IUN Peacekeeping Force

Fort Grays Island Air Base Squadron

Penal units

Long Range Strategic Strike Group

Airborne Warning and Control


Two Osean F-22A flying over Basset Space Center

The Osean Air Defense Force has employed a wide variety of aircraft, ranging from ground assault aircraft to state-of-the-art fighters, such as the YF-23A Black Widow II.

An unnamed Osean aircraft boneyard which stores a variety of machines used by OADF and OMDF









  • In the European release of Ace Combat 5: The Unsung War, the name of the OADF is changed to "Osean Air Defence Force", following British spelling conventions.
  • The Osean Air Defense Force (as portrayed in AC5) is based on the real-world United States Air Force (USAF), bearing distinctly similar service dress uniforms, flight suits, aircraft, rank structure, and organizational structure (albeit outdated; the USAF stopped using the Air Division command level in 1992). However it should be noted that in the USAF, Airman First Class is an enlisted rank and in the USAF enlisted personnel cannot serve as pilots or undergo flight training.
  • It is unclear if Osea formed an official air force during the Osean War.