Now vetting procedures are being tightened both for new recruits and troops who suddenly reappear after going absent.

ECONOMIST: The war in Afghanistan

He called for changes, including the introduction of a new professional body called the College of Policing, to speed up vetting procedures.

BBC: David Ainsworth

He said Isaf has adapted, adjusted and adopted new "drills and skills" to deal with insider attacks, including improved vetting procedures.

BBC: General Sir Richard Shirreff