Yesterday, Call of Duty: Modern Warfare 4 ‘ s new extraction mode, DMZ, launched a few days “early” for players who digitally pre-ordered the military shooter. And a heads-up for folks who love dogs and might be planning to check out DMZ: The intro mission is going to be rough.

Modern Warfare 4′ s new DM Z mode is basically a full-fledged extraction shooter, like Arc Raiders or Marathon , but shoved inside the latest Call of Duty release. Players hop into a large open-world map filled with enemy NPCs and other players to kill stuff, complete missions, loot what they can, and then try to extract with their ill-gotten goods without dying and losing it all. You know, pretty standard stuff for anybody who has played an extraction shooter in the last few years. But DMZ’ s opening is different. It’s a more narrative-driven and scripted affair that starts with a soldier dropping into the DMZ with his trusty dog sidekick, Rex.…