All game textures need to be powers of two. I think the smallest you can have is 4 px, from there it goes 8, 16, 32, etc. Most environment textures you make will be 512 by 512.
Depends on the game engine - some game engines will accept textures that aren't powers of 2.
I thought that Halo CE was one of them - isn't the Assault Rifle texture something odd like 640 x 640 pixels?
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