Halo Anniversary for XBox one Firefight?

So I was told that this anniversary would have everything, including Firefight, which was what I wanted originally, but it I'm having difficulties finding it. How do I start a firefight game?

Thanks!

Firefight was in Halo: ODST and Halo: Reach, which were not included in the collection. So no firefight, unfortunately.

343 is adding Halo: ODST to the collection sometime next year as a gift for the launch screw ups, but as of now it looks like it will only be the campaign.

Destiny has enough 'defend the fixed point' objectives throughout the main story to feel like you're playing a 15-20 hour firefight mode...

I'm hoping they'll add Firefight mode to the MCC at some point, but in the meantime we'll just have to wait and see.