We don't have the chart associated but the 5+ on the top image could be a small jet engine ?I don't have access to the paper, but the illustrations seem to depict an expendable drone that can be released from helicopters, airplanes, or maybe even larger drones. I can't be sure, but it doesn't appear to be powered or have its own targeting system, so I assume it's controlled remotely – basically acting as flying pylons.