It takes a tough mindset to be a successful sniper, to be able to dig in for days on your own as you wait for your target, to stay calm on a battlefield when you yourself have become the target the enemy most want to take out. Craig Harrison has what it takes and in November 2009 in Afghanistan, under intense pressure, he saved the lives of his comrades with the longest confirmed sniper kill - 2,475 metres, the length of 25 football pitches.