On Aug. 6, 2001, our vacationing president was warned by the CIA for the 36th time in eight months that Osama bin Laden was determined to strike in the United States and that recent intelligence had suggested an attack might be imminent. There were at that moment, George W. Bush was told, 70 bin-Laden-related field investigations being conducted in the country. “All right,’’ our president told the CIA officer, “you’ve covered your ass.’’ On one level, Jon Krakauer’s “Where Men Win Glory’’ represents a detailed look at the tragic tale of Pat Tillman, the football star who quit the NFL...