Why even bother with attempting to control insects? Insects are able to traverse through tight spaces quite well. Being used in the event of a natural disaster, insects can be quickly released and crawl through small cracks in order to find survivors. If equipped with thermal cameras, finding people stuck in a wreck can quickly accomplished. The use of insects in the military is also quite an idea, as they are much cheaper than drones and can easily blend in with their surroundings, providing a good set of eyes for allied soldiers.
Then why not just make our own robots? First of all, insects have pre-built CPU’s for us to control — their brains. If we learn what impulses to use, controlling these critters isn’t too difficult. Secondly, insects aren’t a massive lost if killed in action compared to a robot.