Boston Dynamics' BigDog is one insane-level DARPA project; a robotic pack-mule that can carry 400 pounds of kit for troops. At some point, the Massachusetts mechanics decided the bot would be far better if it was the size of a bull or an SUV. The Alpha Dog loses the un-stealthy buzzing noise of its predecessor, has a range of 20 miles and can take much more punishment. If you check out the video after the break, you'll see two people unsuccessfully attempt a takedown on the monster -- Half-Life 2 diehards might experience a combat flashback at the mere sight of it. AT-AT Jr is expected to see field testing sometime next year when it won't have a test bed of rocks to contend with, but the US Marines.