what's your opinion of say, horses used in olden times (heck till about WW-I, quite extensively) in battle ?
Is the modern military's exploitation of animals actually significant compared to any other time in human history?
How does arming dolphins improve the human condition?
The dolphins are scouts for intruding mines and infiltrators - they find something strange, they come back and report it, and are sent out with a buoy to mark it, or attach to the intruder to float them for capture.
In a larger than dolphins specifically sense, it is something significant to think about since autonomous machines will be asked to perform similar tasks and since no war is "anything goes" it will be advantageous to think about how people perceive these other methods of execution.