Halo 3 shipped with 3 versions. The standard 1 disk edition, the 2 disk limited special edition with tin case and the legendary 3 disk edition with a spartan helmet. The special edition and the legendary edition sold out almost immediately in stores despite their high price.
Broke the all times sales record for visual media with over $170 million in first day sales.
The voice overs of most of the marines are the cast of Firefly (2002) and Serenity (2005). Nathan Fillion plays the voices of the Sergeants, on one of the levels he even refers to himself as Sergeant Reynolds. Fillion would later voiced Edward Buck starting with ODST.
As the trailer begins, you can see a "grunt crossing" sign blowing in the wind.