What does this mean exactly?..

I was just on my xbox 360 and found Enlist now, I clicked on it, and it told me to go to this page: https://www.xboxcompetition.com/halo4-enlistment/landing-page/en-gb.html

Can anyone explain to me what it is exactly? :smiley:

Thanks ^^

go to this website

http://www.haloathon.com/halo-4-unsc-enlistment-competition/