Consider the growing infiltration of neo-Nazi groups within the armed services. In 2006 and again in 2009, the Southern Poverty Law Center, a group which monitors racist and right-wing militia groups, concluded:

A decade after the Pentagon declared a zero-tolerance policy for racist hate groups, recruiting shortfalls caused by the war in Iraq have allowed "large numbers of neo-Nazis and skinhead extremists" to infiltrate the military, according to a watchdog organization...

The report quotes Scott Barfield, a Defense Department investigator, saying, "Recruiters are knowingly allowing neo-Nazis and white supremacists to join the armed forces, and commanders don't remove them from the military even after we positively identify them as extremists or gang members."

That zero-tolerance policy was put in place in the aftermath of the devastating Oklahoma City bombing which killed 168 Americans, the largest death toll from a terrorist attack on the U.S. homeland before 9/11.