Mark Scoular, a police officer and ex-Royal Marine who founded Commando 999, said that the Marines would not let the bad weather hamper their marathon challenge over Remembrance weekend.
"It is wet, but we will all be cheery and absolutely fine, I'm sure. It will be a good old pace but we are all looking forward to it."
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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.