NY Times:

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 Southern Poverty Law Center, which tracks racist and right-wing militia groups, estimated that the numbers could run into the thousands, citing interviews with Defense Department investigators and reports and postings on racist Web sites and magazines...read on

I understand that we have a recruiting problem, but:

"Neo-Nazi groups and other extremists are joining the military in large numbers so they can get the best training in the world on weapons, combat tactics and explosives," said Mark Potok, director of the SPLC's Intelligence Project."We should consider this a major security threat, because these people are motivated by an ideology that calls for race war and revolution. Any one of them could turn out to be the next Timothy McVeigh."