Prime Minister David Cameron will kick start the remembrance weekend when he addresses a group of Royal Marines outside 10 Downing Street today.
The Conservative leader will hear a rousing rendition of Jerusalem, sung by the chart-topping Military Wives Choir before the teams of Royal Marines head off around the streets of London to break a speed march world record.
The two teams of Royal Marines will raise around £50,000 for the Royal Marines Association as they run a 26.5 mile course in under four hours and 19 minutes.
More top news
Ewan Williamson,14, died from heatstroke in Australia after police took almost an hour to respond to his distress call, an inquest heard.
Explosives and suicide vests have been seized from a group of suspects stopped on Turkey's border with Syria, the Turkish army has said.
The teenager's family spoke of their "torment and pain" after serial killer Levi Bellfield finally confessed to her murder.