Analyst says `` green-on-blue '' attackers are split between infiltrators , disgruntled security . Gunman in American uniform killed 3 U.S. troops on a Special Operations Forces mission . In another incident , Air Force Maj said Six of its soldiers died . one civilians died in a roadside mine blast in U.S. .
Analyst says `` green-on-blue '' attackers are split between infiltrators , disgruntled security . Gunman in Afghan uniform killed 3 U.S. troops on a Special Operations Forces mission . In another incident , the British Defense Ministry said one of its soldiers died . Six civilians died in a roadside mine blast in Helmand .