British Defense Ministry following a statement announced, they died from injuries sustained in the Nahr-e Saraj district of Helmand province on Wednesday.
The pair are thought to have been killed by insurgents, though the BBC said an Afghan source claimed the deaths were from a “green on blue” attack – where coalition troops are killed by their Afghan allies.
Major Laurence Roche, the spokesman for Task Force Helmand, said: “I am extremely sorry to announce the deaths of a Royal Marine from 40 Commando and a soldier from 3 Medical Regiment serving with Task Force Helmand.
“This is dreadful news for all of us serving in Afghanistan. Our sincere condolences go to their families, friends and colleagues at this time of grief.”
UK is the second largest NATO contributor in Afghanistan and a total of 435 British military personnel have been killed in Afghanistan since operations started in 2001.