Summary: Three US marines were shot dead by an Afghan worker at an International Security Assistance Force (ISAF) base in Southern Afghanistan. And another three US marines from a Special Forces unit had been killed earlier in the day in the same area by a uniformed Afghan police officer. NATO refers to these incidents as "Green on Blue" killings - indicating they are carried out by Afghan police and soldiers or individuals wearing the uniforms. The same police personnel and soldiers trained by and supposedly working hand in hand with ISAF. During 2008, such attacks took place only once or so a year but this year, they have been averaging one per week. And in just the past week, six NATO military died in three separate attacks.
