Green-on-blue (or insider) attacks have been sweeping Afghanistan, leaving dozens of Americans dead, Mother Jones reports. The surge of internal attacks came out of nowhere. In 2007 and 2008, there were just six such attacks combined against members of the US-led International Security Assistance Force. The following year there were 8, the next, 15. In 2011, there were 22 attacks that killed 33 ISAF soldiers and wounded 50. In 2012, the number of attacks more than doubled, with 48 incidents that killed 64 soldiers, accounting for 16 percent of all coalition combat deaths that year.