Students at Arizona State have been working on a jetpack that doesn't propel you vertically, but horizontally. This drastically increases the speed at which the user can run and saves them energy as well. While this device is heavy and doesn't allow the runner to carry much else, they say that they are already finalizing a new pack that is smaller and lighter. This type of technology could be crucial in ground attacks in both rural and urban areas. Soldiers who might be too injured to retreat or make it to an extraction point would be aided by a lighter body and an easier run to safety. This speed could also come in handy when dealing with stealth in nighttime operations as well, allowing soldiers to move more swiftly and go undetected even in large groups [Source