You'll need the wormhole upgrade for this particular exploit. Start mission 12, skip the cutscene, and immediately turn around and go back into the hangar. Take out the two guards, and explore a platform on the left. You'll find three crates, containing 7500 fuel, 500 precious metal, and 4000 minor metal, respectively. Fulton those, grab the intel file on the other side of the room (thus creating a new checkpoint), and abort or restart mission as desired.