SWORD
And here I was, adjusting to 200. There are a few alien races in my universe that lost their homeworlds. A few years ago, I would have said I couldn't imagine it happening to humanity, but things changed.
Maybe I'm an idealist, but I like the idea of uniting humanity, especially when there are bigger threats out there like the Reapers. Think a sentient machine the size of a dreadnought that wants to wipe out all organic life in the galaxy, times a thousand.