Like Lebowski said, Akira was the name of the first test subject. Throughout the movie, Akira comes to represent the inner potential of human beings. The potential for controlling the environment in which they exist. Hence the army wanted to try and harness this potential as a weapon. Unfortunately for them, the potential seems only to exist in children or teenagers who do not quite have the mental capacity to deal with their new found powers. That's sorta the gist of it - or at least what I got out of it. I would say more, but I havent seen it in a while (although now I want to).