It turns out that you put your blood type and your NKA (no known allergies) on my foot and you stick a dogtag in your laces because it’s the part of you that’s most likely to survive if you get blown up. We found feet a lot. If you’re going to find a part of the bomber or victim, you might find their head. It’s a better chance that you’re going to find their hands and feet.
— Brian Castner, on why soldiers tie their ID and blood type around their feet instead of their hands, from 'The Life That Follows' Disarming IEDs in Iraq