It’s quite simple to explain really, 1 out of every 2 Xbox 360 owners in the United States own a copy of Halo 3. To be more exact with the numbers, 52% of Xbox 360 owners in the United States own a copy of Halo 3. The latest sales figures for Halo 3 in the United States show over 4.1 million copies of the game being purchased. Impressive attach rate? You better believe it. What’s even more impressive? The game will continue to sell well in the upcoming months and years.