This.Looks like they're using some Battlefront assets all up in there.
The setting is a nice change though, WWI should have more media on it.
They are speaking in codes.
"Ya..ugh..with Horses and flamethrowers...ugh...you...will get a chance to use them."
Basically indicates certain highlights or digital switches much like Battlefront in the sense of walking over it and pressing a button puts you in a temporary control of the particular character.