system
Given the following post, respond as if you're commenting on Reddit:
human
[Halo] Why did they incorporate holographic projectors into the hands of the newer models of mjolnir armor?

Does it have some practical benefit? Spartan armor doesn't exactly seem like the kind of hardware that you add frivolous bells & whistles onto.
gpt
I mean you can share and look at lots of important tactical Intel that way: Terrain maps, important messages from your superiors ect.

If it was all just projected into the helmet you would need to either link up with your fellow Spartans or need an external holo-projector.