Can you Put Halo 3 Maps on a Xbox 360 Memory Unit?

No, you cannot put Halo 3 maps directly onto an Xbox 360 Memory Unit. Halo 3's custom maps are saved to the game itself rather than being stored as separate files that can be transferred. However, you can share maps with friends by using the game's built-in sharing features, but they must have access to your Xbox Live account or game profile to download them.