Also known as ''AceCombatX2'' prior to its release, ''Joint Assault'' is the eleventh game in the ''AceCombat'' series and the first one to be set on our familiar Earth, rather than the ConstructedWorld of Strangereal. Released in 2010.

The year is some unspecified number in 20XX, some years after the 2007-2008 Global Financial Crisis. It is your first day on the job as Antares One, a rookie pilot in the private military company, Martinez Security. The company is hired to participate in a joint exercise between the American 7th Fleet and the Japanese Self-Defense Force but is waylaid by fighter planes from a terrorist group calling themselves the Valahia.

The Valahia proceed to attack Tokyo, followed by one of their Orgoi flying fortresses, as a prelude to declaring war against the entire world. Meanwhile, Martinez Security aligns with the nations of the world to form the International Union Peacekeeping Force (IUPF) with Antares One leading the charge.
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!! Tropes found in the game

* AmericaSavesTheDay: Played with. Even though game info hints that Martinez is a US-based [=PMC=], and your immediate superior, Burford, is an American citizen as well as hinted to be former U.S. military, the staff is a combination of American and foreign [=PMC=] members. You also have allied [=PMC=] soldiers with you from other countries.
* AwardBaitSong: [[http://www.youtube.com/watch?v=SvakINjeGvA "For us All"]].
* BaldOfEvil: [[spoiler: Andre Olivieri.]]
* BeyondTheImpossible: [[spoiler: Final Sulejmani]] in his second phase uses a missile-dodging roll maneuver no one else can pull; not his teammates using the same plane and [[TheComputerIsACheatingBastard not the player, either.]]
* BilingualBonus: [[spoiler:Varcolac]] is named after the Romanian word for werewolf. The Balaur as well, which is a kind of monster in Romanian folklore.
* BloodKnight: Rigel [[spoiler:Varcolac]] Squadron, particularly Kiriakov.
* BossInMookClothing: AEGIS ships look like normal Cruisers but their twin [=SAMs=] have much greater lock-on range than the norm. To add insult to injury, the first time you meet them you usually won't have long-range missiles yet.
* BossRush[=/=]BonusBoss: This title ups the series' ante by sicking many of these at you in this order [[spoiler: Scarface One and the Z.O.E Commander from [=AC2=], Dision from [=AC3=], Mobius One and Yellow 13 from [=AC4=], Blaze and Zipang from [=AC5=], Galm One from AC Zero, Gryphus One from ACX and Strigon Leader from [=AC6=]]]
* ClaspYourHandsIfYouDeceive: [[spoiler: Andre Olivieri.]]
* DidntNeedThoseAnyway: [[spoiler: Sulejmani's Varcolac and its PD gun.]]
* [[spoiler: DiscOneFinalBoss: The Valahia leader.]]
* EscortMission: One misssion plays with this, by having Player One be the Escorted (under a strict 1000 Altitude limit, and a very harrowing path), and Players Two, Three and Four protecting Player One's six.
* FaceHeelTurn: [[spoiler:Everyone in Rigel Squadron. As you go near the end of the game, you need to shoot them down.]]
* FourIsDeath: Rigel [[spoiler: Varcolac]] Squadron.
* HonestAxe: Referenced in the naming of the Golden Axe Plan.
* [[JokeCharacter Joke Plane]]: The [[UsefulNotes/WorldWarII WWII]] [=A6M=] Zero and [=F6F=] Hellcat fighters. Better hope your skill with guns is up to snuff, 'cause no air-to-air missiles for you!
** They make a return in AceCombatAssaultHorizonLegacy, and they've been promoted to [[LethalJokeCharacter Lethal Joke Plane]] thanks to the [[CutscenePowerToTheMax Tactical Maneuver Command system]] present.
* [[LethalJokeCharacter Lethal Joke Plane]]: Those planes mentioned above? A duo of them took on the Ace of Aces mission [[http://www.youtube.com/watch?v=HVCC-ziIvWE and WON.]]
* LightningGun: The Electrolaser.
* MagneticWeapons: The Balaurs.
* MultinationalTeam: The Martinez Securities staff.
* NGOSuperpower: The enemy, Valahia, is supposedly a terrorist group. Nevertheless they have access to flying battleships, a massive railgun and lots of conventional forces in all three mediums.
* NonActionBigBad: Neither the Valahia leader nor [[spoiler:Olivieri]] fight you in the air.
* OneHitPointWonder: Subverted; a properly-tuned plane can possibly take ''multiple'' missile hits and still fly, even on Ace difficulty.
* ObviouslyEvil: Played straight with [[spoiler: Olivieri. Hint: the guy that's profiting from war? he's a ''bad'' guy.]]
* ParentalAbandonment: The FreudianExcuse of [[spoiler: Sulejmani]] is that his parents sold him off as a {{Child Soldier|s}}.
* PathOfMostResistance: The mission where you fly a 747 in a ravine offers you a long path with flak and proximity-triggered mines or a short one with AAA and missiles. Choose your poison.
* PrivateMilitaryContractors: Return in here, with the player(s) employed by Martinez Security.
* [[RealMenWearPink Real Men Fly Pink Raptors]]: One of the unlockable paint schemes for the X-02 Wyvern is pink.
* RealLife
* StoryDrivenInvulnerability: [[spoiler: Varcolac]] have the same deal as Yellow from ''4''.
* SoundtrackDissonance: A milder version of this is present, where the track played during the level where the Spiridus goes down is a ''[[http://www.youtube.com/watch?v=POmXCjh4wgc freaking piano orchestra]]''. Yet it somehow fits.
** It also qualifies in the same way ''Ace Combat 2'' does, due to reusing a few tracks from ''2''.
* TheVoice: You can choose between a male American and British combat operator, a female Japanese and Swedish combat operator.
* WithThisHerring: This game gives you the option of flying either the F6F Hellcat or the [=A6M=] Zero, both propeller planes used in WWII.
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