Pre-order a copy of Halo 3: ODST from a participating retailer and you'll be able to play as Sgt. Johnson in Firefight mode. Here's a break down of all the participating retailers around the world offering the Sgt. Johnson bonus so far:
I think it's a great little bonus to be able to play as Sgt. Johnson. He was there when the war first began on planet Harvest and almost lasted long enough to see the war end.
Take a look at the gallery below to see Johnson going at it in Firefight mode. Are any of you looking forward to playing as him?