The AIR arm you seen in the video below can only lift two or three pounds at present--not enough to make it militarily viable. But the arm itself only weighs a half-pound, giving it far greater strength-to-weight than the rigid, "gears-and-actuators" arms generally deployed on something like iRobot's Packbot platform (these usually lift some fraction of their own weight). The arm below has also had its strength reduced for these initial tests. On operational arm could lift many times its own weight, and its air pressure would scale so that if it ran into an obstacle or a person, it would buckle rather than bash. That makes it safer to operate in chaotic environments with humans in the mix.