The 4MM part of the 4MM Project refers to the legendary four-minute mile, the benchmark of athletic performance. It wants to create a low-force booster jetpack that can push any reasonably fit person to run a mile in less than four minutes.
The initiative was kicked off by DARPA, which asked the robotics team at the Arizona State University to tweak its disability aids to help boost the performance of able-bodied soldiers. So here's a video of a man doing something quite dangerous involving a small-scale engine on his back:
The idea being the soldiers of the future can run in, pull of a few headshots, then run out again quicker and get back to base to upload the headcam footage to YouTube quicker than ever. [Vimeo]