on veteran they hit you non-stop while running, you need a decoy (ur m8) and most of the time you run out of bullets and you die before you reload.
because there isn't just one juggernaut...more like three or five at the same time
the easiest way to defeat them is to block them while you are injured... they will ignore you and you can knife them to death.
and your m8 revives you when the timer is about to run out, but as I said, thats just lame.
the wave-defence at burgertown with 2-3 sentry turrets is the best mission in my opinion