A Royal Marine initially believed to have been killed in an Iraqi ambush actually died under "friendly fire", the Ministry of Defence has said.
Marine Maddison was on river patrol on the Al Faw peninsular
Marine Christopher Maddison, 24, of Scarborough, died on a river patrol on the Al Faw peninsular in March 2003.
An internal inquiry has discovered the marine was killed by his own side after a series of operational errors.
The inquiry's leaked report also criticised the original investigation as flawed and full of factual errors.
Plymouth-based Marine Maddison died of shrapnel wounds after his landing craft came under fire.
The internal Board of Inquiry report was prompted by BBC One documentary Fighting the War, which claimed to have unearthed new information that cast
into doubt the belief that he died in combat.
The leaked report said Marine Maddison was the victim of a 3 Commando operation plagued by
"bad planning, unreliable communications, inadequate equipment and poor
It said the ability to make sure everyone in the battlefield knew where everyone else was - known as battle space management - had broken down.
There was no chain of command, standard operational procedures were not used and communications were unreliable, the report said.
It recommended that some of the brigade's practices should be reviewed.
The leaked report also criticised the initial investigation into
Marine Maddison's death by the MoD's Special Investigation Branch (SIB).
"It is the board's view that professional inadequacies, factual errors, a
lack of rigorous investigation of the facts available at the time... were the
prime causes of the production of an inaccurate set of findings," the report
Marine Maddison's mother Julie told BBC News: "It is disgraceful that we might never have
known what happened to Christopher, and we had the right to know.
"The military sometimes, I think, have this idea that once they have signed
up a recruit they do not belong to us anymore. But they are quite happy to send
them home in a coffin."
A spokeswoman for the MoD said efforts were being made to minimise the chances of the incident being repeated.
She said the Board of Inquiry's report was an internal document and as
such, she could not comment on the reports of its specific contents.
However, the MoD has confirmed that marines from 40 and 42 Commando were on either side of the waterway where Marine Maddison's 9 Assault Squadron was working.
He was one of a group of Marines on a craft heading up an Iraqi river which
came within range of another group of marines equipped with anti-tank rockets.
They thought they were observing an enemy craft and fired a rocket which hit
the craft. Marine Maddison was injured and later died.