For the special mission in Ace Combat: Joint Assault, see Operation X (ACJA).

Operation X is an special stage available in Ace Combat X: Skies of Deception. It is unlocked by completing all of the game's missions, which requires at least three playthroughs. A non-canonical mission similar in concept to "The Gauntlet" from Ace Combat Zero: The Belkan War, Operation X has players engage the game's fictional aircraft, such as the XFA-24A Apalis and the YR-302 Fregata.


The goal in Operation X is to fight through formations of all of Ace Combat X's original aircraft, except for the Fenrir. As you progress through the mission, enemies will begin spawning all around your position, often overwhelming you in higher difficulties. Once the X-02 wave is destroyed, you will be engaged by a squadron of four ADF-01 FALKEN aircraft, the main targets of the mission, which are armed with TLS laser pods. Destroying the FALKEN formation will finish the mission.

In Normal mode and higher, once a single ADF-01 remains, two unidentified aircraft will engage the battle from both sides of the map, the aircraft in question being the aces ADF-01 "Z.O.E." and XFA-27 "Scarface" from Ace Combat 2, bearing their original paintjobs. Killing both pilots will unlock their respective aircraft's Special paint scheme.

Enemy Lists

Standard Units

Unit Points Count Notes
Icon-AirEnemy.svg Apalis 680 2
Icon-AirEnemy.svg Fregata 700 2
Icon-AirEnemy.svg Cariburn 720 2
Icon-AirEnemy.svg Forneus 740 2
Icon-AirEnemy.svg XFA-27 760 2
Icon-AirEnemy.svg X-02 780 2
Icon-AirTGT.svg FALKEN 800 4

Special Units

Unit Points Minimum
Icon-AirEnemy.svg XFA-27 "Scarface 1" 2000 Normal [note 1]
Icon-AirEnemy.svg FALKEN "Z.O.E." 1800 Normal [note 1]

S rank

Earning an S rank requires completing the mission under 7 minutes.[1]



  • Operation X marks the first occasion where an enemy-controlled ADF-01 is able to use the TLS. Unlike the player, however, the TLS-wielding FALKENs will often hit with quick swipes that deal low to medium damage, instead of outright killing the player.
  • All the enemy aircraft are the ones that can be tuned in the Hanger for the player.


  1. 1.0 1.1 Appears and engages the player when one TGT FALKEN remains, if no more than 5 minutes have elapsed since the FALKEN wave was spawned.


  1. Ace Combat X: Skies of Deception - The Complete Guide, page 167.