Combat percentages, as explained in Phil Klay’s Redeployment
by Mr. Sheehy
Somebody said combat is 99 percent sheer boredom and 1 percent pure terror. They weren’t an MP in Iraq. On the roads I was scared all the time. Maybe not pure terror. That’s for when the IED actually goes off. But a kind of low-grade terror that mixes with the boredom. So it’s 50 percent boredom and 49 percent normal terror, which is a general feeling that you might die at any second and that everybody in this country wants to kill you. Then, of course, there’s the 1 percent pure terror, when your heart rate skyrockets and your vision closes in and your hands are white and your body is humming. You can’t think. You’re just an animal, doing what you’ve been trained to do. And then you go back to normal terror, and you go back to being a human, and you go back to thinking.
from Phil Klay’s “After Action Report” in Redeployment