Similarly, there was that time US soldiers fired on a camera crew, even laughing at them for being incompetent terrorists when they ran around. Or they just capture and torture them with a poor explanation.
http://www.reuters.com/article/2010/04/06/us-iraq-usa-journalists-idUSTRE6344FW20100406
This rather serious report should be of interest to LW. It argues that autonomous robotic weapons which can kill a human without an explicit command from a human operator ("Human-Out-Of-The-Loop" weapons) should be banned, at an international level.
(http://www.hrw.org/reports/2012/11/19/losing-humanity-0)