The US Air Force is now seeking suppliers for a "counter ultra light aircraft/paratrooper system" (CULAPS, for short). According to the solicitation, here's the basic idea:
The CULAPS system is envisaged as a lightweight net aimed and fired from the ground that envelopes the target and thereby removes the target's lift bringing it to the ground. The system should be lightweight (man/vehicle portable) and have an effective vertical range of greater than 500 feet. An attribute of the system should include the potential for linking the firing system to a sensor system for automated remote operation.If you are an interested supplier -- or if you are, say, Spiderman -- you have until 20 February to submit your response.