"Operation Storm," the marine replied, "Is the single most ambiguous operation you have ever or will ever participate in... I can't give you all the details. All you need to know is that you will be fighting for the good of the dimension... For unity. You will be a rock in the middle of a raging hurricane... You see, Cadet, you have been chosen, not by me, but by someone... Someone else... To eventually become the leader of entire planets. But before you can take that role, you must help us fight for it..."
He stood up and made some sort of hand gesture, at which point holograms appeared on his desk, recapping him on recent events in the galaxy -- about Plex, mostly. The hologram was actually revealing news footage taken by Galactic, Inc. of recent events. It would be more than enough to recap recent history for the Star. When the hologram was over, the marine waved his hand and it vanished.
"If you choose to accept, you will be sent out with your new brothers in arms right away for a very important mission before your training begins."