A Look at the Tunnels, Helicopter Combat and Blood of Call of Duty: Black Ops

We already saw a bit of gameplay from Treyarch's upcoming Call of Duty: Black Ops, but this E3 trailer shows us some interesting surprises.

There's the harrowing tunnel combat, the ability to gun down enemies from the back of a Hind helicopter and more blood then we're used to seeing from a Treyarch title.