The Defense Advanced Research Projects Agency (DARPA) has developed mind-controlled cyborg insects to replace Micro-Aerial Vehicles for purposes of military surveillance.
"Behold, to morrow will I bring the locusts into thy coast:"
These modified insects will be easier and cheaper to develop in large quantities, than their purely robotic counterparts.
"And they shall cover the face of the earth"
Once perfected, the computerized implants will be fueled by the excess energy lost in the beating of the wings and will not need tiny batteries.
Once installed in an armada of flies and locusts, DARPA will secure their ranking as "go-to" organization for DIY Biblical Plagues.