Straight from 343 Industries Halo Waypoint guys they have dropped 7 minutes of somebody playing Halo:Reach.
They are playing a new gametype called Invasion where the map unlocks in sections similar to Battlefield Bad Company 2′s Rush Mode. As the game goes on you unlock more loadouts to use while you either attack or defend objectives. This is determined by if you are a spartan or an elite.
This playlist also makes it where if you want to end up on the same team it is wise to join with an even number because you will be split into pairs. They do this so you can spawn on your friend like BFBC2 but on a smaller basis.
The person playing is pretty awful but then again I have OCD when people don’t reload their guns immediately or not effectively use their armor ability in key situations.