I’ve already left my note. Have you? Clicking on the pic below will take you to a site that will allow your message to become part of Halo history as well as Master Chief’s helmet.
Each little piece you see is a message by someone. This website is interactive too. You can move your mouse up and down, left and right and the helmet will move as such.
It’s even better if you are using a tablet! Move your tablet around and the helmet moves with it! Very cool!!