You had to Pre order it to get Johnson.
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To obtain the activation code to unlock Sergeant Johnson for use in Firefight, you must of pre-ordered the game.
Unlock Halo 3:ODST's Campaign Complete Achievement. Once you beat the ODST campaign, visit Halo Waypoint on the dashboard to unlock the item.
In Halo 3, you play as the Master Chief, the last surviving super-soldier of the Spartan II group. In Halo 3: ODST, you play as an ODST instead of the Master Chief. There are also different weapons in ODST.
you get the multiplayer beta with odst but not the whole game it the beta comes out may 3rd 2010 halo 3 odst included also xbox live gold
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