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Mike Day woke a minute after being attacked by three al-Quaeda insurgents - and then incredibly shot dead two of the terrorists before walking to a medical helicopter.

But since the incident in 2007, which saw him wounded in both legs and arms, as well as his stomach and scrotum, he has made an amazing recovery.

He's now preparing to take part in a half-Ironman race, involving a 1.2 mile swim, a 56 mile bike ride and a 13 mile run to raise money for fellow veterans.

Speaking about the dramatic incident in a CNN interview, Day said: "The grenade rolled across the room, blew up and knocked me out. There were still a couple of guys in the room, so I eliminated the two guys, got up on my hands and knees and asked for status on the house.