Lieutenant John Thornton, 22, and Marine David Marsh, 23, both of 40 Commando, were conducting a patrol near Kajaki, in Helmand Province, when their vehicle was caught in a blast.

Lt Thornton's parents Linda and Peter, and his brothers Ian and Graham, said he "died a hero, following his dream".

Their son, known as "JT", from Ferndown, Dorset, had wanted to be a Commando since he was 13-years-old and had previously served in Iraq having joined up in August 2004.

The family said: "He said on many occasions 'I have the best job in the world'. He died a hero, following his dream and doing the job he loved.

"His death will leave a massive gap in all of our lives. We will not forget him."

Marine Marsh, known as Dave, was from Sheffield, but had recently moved to Taunton, Somerset with his wife, Claire, and young daughter, Molly.

He leaves behind parents, Gary and Maxine, and sister Katie.

His wife said: "David was a loving and dedicated family man.

"He went though life with a smile on his face, which will continue through our beautiful daughter. The Royal Marines was his passion and love. He will always be our hero."