Shadow the Hedgehog: Story Cycle 7: Part 4: Sky Troops (Dark Mission)

The theme of this stage is started through a rhetoric called "The Lesser of Two Evils".
Dr. Ivo "Eggman" Robotnik wants to rule the world and build it into his Eggman Empire.
HOWEVER, the Black Arms threat on the world was concerning even HIM. While he wants to conquer the world, Black Doom wants to completely DESTROY it.
Eggman decided to bring his own army to battle against this newer evil!
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Later on, Shadow observes the flying fortress that Black Doom commanded. He had sent it to the Eath 2000 years ago, waiting for the right time to unleash it upon the planet.
They then noticed the Eggman Fleet coming their way, it was up to Shadow to decide what to do with it...
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For the third time, here are this stage's three selectable missions.
Dark Mission: Help Black Doom destroy Eggman's fleet. There will be Black Arms turrets to use for this.
Normal Mission: Reach the Goal Ring towards Eggman's flagship.
"Hero" Mission: Help... Dr. Eggman(?!) destroy the temple jewels that keep Black Doom's fortresses afloat.
I've already covered Sky Troops' Hero & Normal Mission, so this time I'm going for the Dark Mission.
For this, there will be Black Arms turrets stationed nearby each of Eggman's ships. Board one and blast them away! Preferably against their own turrets and whatever shells they launch at you from them. You even get to do this against Eggman's gigantic flagship at the very end.
Oh, and if you do this WHILE Eggman is following you, he'll actually react and complain about it!