Remote-control and remote-sensing warfare is advancing each day. Add to my previous post on remote cameras this nugget of information:
These 'rocks' ... will be sent from an aircraft and will detect enemies by 'listening' to them from 20 to 30 meters. These sensors should be operational within 18 months and they should be cheap enough to leave them on the battlefield after they completed their tasks.
Source: Roland Piquepaille and DefenseTech
Closing and reducing the sensor-to-shoot window is but one element here, other dimensions are intelligence and security. Similar to the acoustic nets for submarines, these can be a force multipliers for recon and perimeter sentries, among other applications. We need to be cautious not to rely too heavily on technology to provide us the answer whether to shoot or not. The new asymmetric enemy will foil the best technology. We need to keep humans in the loop to give the human interpretation.