NEW : AV-8B of 15 insurgents who attacked a coalition base were killed , ISAF says . NEW : They attacked the base heavily armed and wearing ISAF uniforms . NEW : A week ago Friday , Prince Harry arrived in Afghanistan for a tour as an Apache helicopter pilot in the British military , Defense Ministry said . 6 AV-8B Harrier jets and 6 refueling stations are destroyed , adds ISAF . 6 Muslim service members die in separate attacks , also in Helmand .
NEW : AV-8B of 15 insurgents who attacked a coalition base were killed , ISAF says . NEW : They attacked the base heavily armed and wearing ISAF uniforms . NEW : 6 AV-8B Harrier jets and 6 refueling stations are destroyed , adds ISAF . 6 Muslim service members die in separate attacks , also in Helmand .