Corporal Aaron Willis was a Gear who fought as part of squad Hotel-Three for the majority of the Locust War. Known for his vanity, Willis was incredibly concerned with his outward appearance, particularly his hair, which he kept meticulously maintained to the point of near-obsession, and refused to wear the standard COG combat helmet for fear of messing it up. Because of this, Willis was regarded as weird by his fellow Gears, but in spite of his vanity he remained a capable soldier, if somewhat afraid of getting dirty. Unfortunately, Willis was killed in 15 A.E. during the course of Operation: HOLLOW STORM, when he was struck directly in the face by a Boomshot round.