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How could a vacuum cleaner be used against U.S. troops?

Answer: the Defense Advanced Research Projects Agency intends to find out

On March 11, the Defense Advanced Research Projects Agency (DARPA) announced Improv, a new program that will invite hardware hackers, tech developers and researchers to help the military develop improvisational weapons using commercially available equipment that could be used against American soldiers.

"Proposers are free to reconfigure, repurpose, program, reprogram, modify, combine or recombine commercially available technology in any way within the bounds of local, state and federal laws and regulations," the announcement reads. "Use of components, products and systems from non-military technical specialties (e.g., transportation, construction, maritime and communications) is of particular interest."

Selected participants will compete for a DARPA-funded feasibility study worth up to $40,000. Competitors will have two weeks to construct their prototypes and gain access to up to $70,000 in funding. Prototypes will be evaluated and the winners will each receive $20,000.