Han Solo is an unlockable cheat skin that can be used in Mercenaries: Playground of Destruction.
The player can unlock this skin after collecting a certain amount of National Treasures. These are the large grey boxes with a symbol spray-painted on the side.
Otherwise the player can just simply go to the factions screen on their PDA and input the following code; Left, Left, Right, Right, Up, Down, Up , Up. This skin is purely for aesthetic reasons and does not change gameplay in any way.