A group of Royal Marines have received a send off from the Prime Minister as they set off around London gunning for a world record as part of the Remembrance weekend.
The marines left Downing Street to embark on a marathon speed-march, carrying kit and an SA80 assault rifle which combined weigh more than 40lb (18kg).
They must get round the 26.5 mile course in less than four hours and 19 minutes to break the record, currently held by the RAF Regiment.
The charity effort hopes to raise £50,000 for the Royal Marines Association and Commando 999.
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