Interstellar War:

In 2032 Earth is attacked by a ship from another world without cause.  The military somehow learns the location of their homeworld, and a colonial ship, one designed to take people and embryos to a distant world at a speed of 0.81c so that they can colonize it, is crewed by military personnel and sent to their world to take the fight to them.
We were "born" aboard that vessel from the embryos it carries.  Our entire life has been spent in ultra-realistic VR training for the assault.  After more than thirty years, we are now arriving on the planet.  When we land we discover one thing that we didn't expect: they're human.

[url=http://www.roleplayerguild.com/topics/85983-interstellar-generational-war/ooc]I started it[/url]