Coalition forces have started using what they call `` guardian angels , '' or armed troops who oversee others during meal times and when soldiers are sleeping . Afghan defense official : Recruits must pass background checks and provide government references . Insider attacks are sometimes committed by Afghan soldiers , sometimes by the Taliban . Official : Motives range from emotional stress to being influenced by insurgency . Comment:
Afghan defense official : Recruits must pass background checks and provide government references . Insider attacks are sometimes committed by Afghan soldiers , sometimes by the Taliban . Official : Motives range from emotional stress to being influenced by insurgency . Comment: