Project Name
Isn't it a shame that they called it "Orion"?
As far as I am aware "Orion" was the name given to the concept of nuclear pulse propulsion where a rocket would be propelled by small nuclear explosions "pushing" on a plate at the back of the craft.
Has anybody read Larry Niven's "Footfall"? An Orion craft spearheads the best space battle I have ever read.