There's an experimental webcomic about an alternate history of the afghan war where the military develops a spy network of millions of robotic spiders, but for lack of operators decides to open source their operation on the internet.

Among other novel uses of tech in warfare, they deploy an 'empathogenic' aerosol which goes to work on the empathy centers of the brain, making people permanently unable to kill. The story revolves around an American soldier who was accidentally exposed to it. See: http://www.e-sheep.com/spiders/3.5/10_knife.html and http://www.e-sheep.com/spiders/3.5/000_hospital.html and http://www.e-sheep.com/spiders/3.5/11_epilogue.html