You can't
You press R3 to change to third person, pressing it again you can go back to first person (you can only switch when your in a vehicle).
In Call of Duty: Modern Warfare 2 you can which from first-person to third-person perspective, but not in real-time.
Halo3 what dumb person wouldn't know that!
In the console, type "third person". Although that is the command, it most likely will not work. Some servers allow you to switch to third person by type "+view" in the console.
Yes, you may play in a "First Person" view, or switch to a "Third Person" view as well.
press the enter button on the num pad
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In "Return to Castle Wolfenstein," there is no official way to switch to a third-person perspective in the standard gameplay. However, players can use console commands to achieve this effect. By enabling the console with the tilde key (~) and entering the command "cg_thirdperson 1," you can switch to third-person view. Keep in mind that this may affect gameplay and is generally used for fun or testing purposes.
Their isn't any cheats for Halo3
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Yes, you can. The default button to switch between first and third person is P, but you can change it to whatever you'd like.
In the first Ghost Recon Advanced Warfighter, you can't switch to third person, it's a feature special to the second