It takes a tough mind-set 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 wants 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.

In July 2009 Geraint (Gez) Jones was sitting in Camp Bastion, Afghanistan, with the rest of The Firm - Danny, Jay, Toby and Jake, his four closest friends, all junior NCOs and combat-hardened infantrymen. Thanks to the mangled remains of a Jackal vehicle left tactlessly outside their tent, IEDs were never far from their mind. Within days they’d be on the ground in Musa Qala with the rest of 3 Platoon - a mixed bunch of men Gez would die for.  

In Helmand province in July 2006, Major Adam Jowett was given command of Easy Company, a hastily assembled and understrength unit of Paras and Royal Irish rangers. Their mission was to hold the District Centre of Musa Qala at any cost. Easy Company found themselves in a ramshackle compound, cut off and heavily outnumbered by the Taliban in the town.

April 2004: Dan Mills and his platoon of snipers flew into Southern Iraq, part of an infantry battalion sent to win hearts and minds. They were soon fighting for their lives. Back home we were told they were peacekeeping. But there was no peace to keep. Because within days of arriving in theatre, Mills and his men were caught up in the longest, most sustained firefight British troops had faced for over 50 years.

Peter Ratcliffe served in the SAS for 25 years. Blooded in Oman in the 1970s, he also saw action in Northern Ireland, in the Falklands War, and in the Gulf campaign. From his early days in the Paras to his time as Regimental Sergeant-Major in the Gulf, he has lived and fought by the motto 'who dares wins'. Eye of the Storm is his insider's account of that exceptional career. 

As a senior non-commissioned officer of Delta Force, the most elite and secretive special operations unit in the US military, Command Sergeant Major Tom Satterly fought some of this country's most fearsome enemies. Tom is a legend even among other Tier One special operators. Yet the enemy that cost him three marriages, and ruined his health physically and psychologically, existed in his brain. Told through Satterly's firsthand experiences, it also weaves in the reasons for his career-long battle against the most insidious enemy of all: post-traumatic stress.

Everybody has heard the SAS motto that who dares wins, but Special Forces warrior Dean Stott also lives his life by another powerful mantra - that of the relentless pursuit of excellence. In 16 years of service, Dean rose to the top of Britain's fighting force, taking part of some of the most daring and dangerous operations in the war on terror. But then, following a horrific parachuting accident, Dean's dream career was cut short, and his ethos was put to its toughest test.  

Kevin Fulton was one of the British Army's most successful intelligence agents. Having been recruited to infiltrate the Provisional IRA at the height of the Troubles, he rose its ranks to an unprecedented level. Living and working undercover, he had no option other than to take part in heinous criminal activities, including the production of bombs which he knew would later kill. So highly was he valued by IRA leaders that he was promoted to serve in its infamous internal police - ironically, his job was now to root out and kill informers.

A captain in 29 Commando, Johnny Mercer served in the army for 12 years. On his third tour of Afghanistan, he was a joint fires controller, with the pressurized job of bringing down artillery and air strikes in close proximity to his own troops. Based in an area of Northern Helmand that was riddled with Taliban leaders, he walked into danger with every patrol, determined to protect them. Then, one morning, in brutal close-quarter combat, everything changed....

We all have break points to face - at the gym, in the office, in our personal lives - those moments of self-doubt where we have to dig deep and find something within to grab hold of and push us through. Ex-Special Forces soldier Ollie Ollerton has faced his own break points, and now he tells us the lessons he has learnt along the way. From survivor of a freak childhood attack to elite fighter, Ollie's incredible story features high-speed shoot-outs, counter-terrorism and humanitarian heroics.