The fireteam of marines in the demo

Did anybody notice in the demo the fireteam of marines that were looking for something or someone.
and when Halo released that clip of making the demo they had 4 actors with the green screen and that kind of stuff and one of the actors got ran into. Aegean to the original demo one of the marines were limping.
Maybe I am crazy but I thinks those marines are going to play a big role in Infinite.

Marines will always fight on the Chief’s side.