Collect space junk. Build a Habitat. Also, I'm pretty sure I saw them attach rockets to the Statue of Liberty's head. I mean, that's all you had to say: "Attach rockets to the Statue of Liberty's head." Done. Sold.
You're a commander working with a team of engineers to build, fly, and fight for Earth's survival. Well, actually, forget Earth. It's too late for that.
Any object, debris, and junk can be used to craft your habitat. Anything flies if you attach it to a rocket. You can salvage enemy habitats to add to your own. And, using mining resources and researching through the tech tree, everything is upgradable.
Nothing is at stake except humanity.