The report from US Central Command, which oversees operations in Afghanistan, cited a collective failure by soldiers, commanders and air crew members to execute the fundamentals of the mission. As a result, the five Americans and one Afghan were mistaken for enemy forces and were attacked with two laser-guided bombs.
Many details of the report were blacked out before its public release yesterday.
The incident was one of the deadliest friendly fire episodes of the entire war, which began 13 years ago next month.
Unidentified members of the ground forces, which included an Army Special Forces unit, were faulted for incorrectly communicating some troops' positions and for not knowing that the B-1 bomber's targeting gear is incapable of detecting friendly marking devices of the type used by US ground forces in the June 9 operation. These failures led to the mistaken conclusion that the targeted US and Afghan soldiers were insurgents.
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The Air Force said it would study the report before deciding on any disciplinary action.
The June incident happened in Zabul province in southern Afghanistan at the end of an operation led by the Afghan army and supported by Army Special Forces. Their aim was to disrupt insurgents and improve security for local polling stations in the Arghandab district in advance of the June 14 Afghan presidential runoff election.