ONI: Sword Base Glitch (Easy CR):

Start the map and go to the right, up the stairs you should find an Elite... kill him then continue to the right side on the ledge of the right wall of the map. Continue on the right map until you get to the building. Once inside the building quickly move to the left side of the map and pick up the airstrike. Go behind a pillar and wait for the enemies crowd up outside and then wait for the checkpoint.... then have fun and kill the enemies with the airstrike. After it is complete press start and press go to last saved.... Do this process over for about 15:00 and then end the game you will tons and TONS of credits (cR).