Robotic pack mule-

http://www.dailymail.co.uk/sciencetech/article-2251164/Roll-The-amazing-moment-giant-robotic-dog-falls-gets-right-again.html

Roll over! The amazing moment a giant robotic dog falls into a riverbed (and gets straight back up again)
400 pound robot is being developed to follow soldiers on the battlefield and carry heavy equipment
Can follow voice commands from its 'owner' and automatically follow them for upto 200 miles
By MARK PRIGG
PUBLISHED: 11:06 EST, 20 December 2012 | UPDATED: 13:19 EST, 20 December 2012
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US military bosses today showed off the latest tricks they have taught a giant robotic dog.
Officially named LS3 but dubbed AlphaDog, the four-legged, autonomous robot can follow a soldier, and is designed to carry heavy equipment.
Researcher have given it a dramatic update, allowing it to listen to its owner and follow voice commands - as well as the ability to roll over.