On The Level The Covenant, start at Rally Point Alpha and then proceed to the part where you are leaving the 3rd tower. Get a mongoose and drive towards the next loading point. Before you hit that loading point, make sure a brute at the tower is being infected. Now, go grab the Hornets and skip the scarabs. Get out of the map and use the Time Travel Glitch. Now fly back to the 3rd tower and there will be a 2nd secret marine there. At the tower, a few brutes may be half-infected if you did it …

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