X-COM: Enemy Unknown
There have been countless UFO sightings all over the world. As a response to the sudden alien threat, the world's leaders founded the X-COM project. A group of the world's most elite soldier, most intelligent scholars, and most skilled tacticians. The X-COM project aims to defeat the aliens and save the people of the world. You are a new recruit of the X-COM project. Perhaps you've encountered these aliens before. Maybe you want to see what makes them 'tick'. Or maybe all you care about is defending your home country from this foreign threat. Regardless of your motives or beliefs, X-COM has recruited you.
This will be a d20 Modern campaign, set in the X-COM universe. I will be using the games as reference, but will also change and edit things as I see fit. Come join X-COM, and shoot some aliens.