It's sad, but I did that Juggernaut mission solo with two controllers just to make sure it worked. 
Assuming that the IW times are on regular, I still don't know how you could finish that map in the 3 minutes or whatever that they took. You basically have to know where they spawn and head shot them with the thumper when you first see them but before they shoot you. Guh.

Assuming that the IW times are on regular, I still don't know how you could finish that map in the 3 minutes or whatever that they took. You basically have to know where they spawn and head shot them with the thumper when you first see them but before they shoot you. Guh.