Trigger men : shadow team, spider-man, the magnificent bastards, and the American combat sniper by Hans Halberstadt

"Based on hundreds of hours of exclusive interviews, Halberstadt gets inside the sniper mind and shows how they think and interact with each other, how missions are planned and executed, how the weapons work, and even what happens when a bullet finally strikes its target. There are only a few hundred snipers from all the services put together in combat at any one time, making this true inside story a rare and important event." - Macmillan