DARPA's AlphaDog robotic pack mule is ready for battle (and awesome)
extremetech.com
extremetech.com
I don't know what the chances of AlphaDog against a man with a high powered rifle, but think of this: A number of these, armed with some sonic weapons (http://en.wikipedia.org/wiki/Sonic_weapon), attacking a compound at night. Then, the "instill a little fear in the enemy" bit may not sound so stupid.
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But there are so many technologies that you can integrate together on the Alpha dog (platform) to create so many military capabilities.