Those are Strykers, and despite the narration, there's no live ammo evident in that video. The ground guide's rifle also still has an arms room toe tag on it, so they aren't looking to go right into the *expletive deleted*it.
They do seem to have M2's in the mounts, so unless there's more info, I'd speculate going to or coming from a range.
Next time get a bumper number and unit, so we can properly tinfoil. And flip your iPhone over to HD video. I've seen Al Quieda IED videos with better focus and resolution.