Analyst says ` ` green - on - blue '' attackers are split between local , disgruntled security . Gunman in Afghan province killed 3 American soldiers on a Special Operations Forces mission . In another incident , the Afghan Defense Ministry said one of its soldiers died . Thomas E. Kennedy , 35 , of West Point , New York . Six civilians died in a land mine blast in Helmand .
Analyst says ` ` green - on - blue '' attackers are split between local , disgruntled security . Gunman in Afghan province killed 3 American soldiers on a Special Operations Forces mission . In another incident , the Afghan Defense Ministry said one of its soldiers died . Six civilians died in a land mine blast in Helmand .