Like, yes, we have drones, and yes, we have firearms, and yes, we can add one to the other--but is it really a good idea?
The potential for abuse of such systems is absurd; I cannot believe that any engineer with a shred of morality would voluntarily work on such things without at least a solid explanation of why doing so is permissible.
Mark my words: these things will mostly be used against civilians and dissidents--not standing armies.