how do you get the ninja armor in halo 3?

[SUPER JEW]

not hayabusa, the other one. its also called recon. what do you have to do?
no. this is a vid of the armor.

http://youtube.com/watch?v=WGyE7JUDnNc

 

[chase k]

you have to collect all the silver and gold skulls

 

[Fantom Wolf]

The "ninja armor" is the Hayabusa armor.

To get the Hayabusa Body, unlock 5 Skulls.
To get the Hayabusa Shoulders, unlock 9 Skulls.
To get the Hayabusa Helmet, unlock all of the skulls.
To unlock the Hayabusa Sword Add-on (attaches to back of Body Armor), you’ll need to unlock all of the achievements in Halo 3 (1000/1000 GS).

I Hope That Helped!