Debi Allbutt has spent ten years trying to hold the MoD to account over the death of her husband, in March 2003.
Corporal Stephen Allbutt died in a “friendly fire” incident in Basra.
Debi felt there could have been better training for the use of equipment.
She said: "In every day life our employers have a duty of care to all their employees, so what makes the MoD any different?"
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The mum wrote the emotional letter after her eight-year-old with Down's syndrome was the only child in his class not invited to a party.
More than 1,800 litter pickers will clear an estimated 57 tonnes of reusable items and half a million sacks of rubbish.
Time for Project Let's-Make-the-Best-of-it.