Pluggedin: Duck-and-cover blasting of enemy forces in rubble-strewn streets. Storming up flight after flight of stairs to take out a skyscraper-mounted radio tower. Jumping onboard a Black Hawk helicopter to man its 50-caliber minigun in a cat-and-mouse air battle. Joining a scuba suit-clad Navy SEAL team to scuttle a Russian submarine and use its missiles to bombard an armada of attack ships. These are just a few of the initial, adrenaline-laced assignments of Call of Duty: Modern Warfare 3.