Forget about the Segway. You want one of these.
Improve the battery life, increase the speed, harden it to defeat gunfire and it's the pretty darn close to what Robert Heinlen described in his book, Starship Troopers. (http://en.wikipedia.org/wiki/Starship_Troopers) (The mobile infantry featured in the movie would have been much more badass if they had been equipped with the armored super suits described in the book.)
HULC (http://www.youtube.com/watch?v=sz5NxIvdPt8#)
Found at AoS, the link points to this article at The Blaze. (http://www.theblaze.com/stories/the-hulc-catch-a-glimpse-of-the-new-exoskeleton-that-could-revolutionize-the-battlefield/)
Ten or twenty years from now a few dozen soldiers equipped with this stuff will be able to wreak the kind of destruction that can now only be delivered by tanks.