When a soldier in training looks down the barrel of his rifle, what does he see? Well, that depends.
In her book Targets, lauded German photographer Herlinde Koelbl answers that question with images of soldiers' practice targets from more than two dozen countries. Through the 240-page collection, you can see the variation of choices—some prefer the impersonal approach of a simple bull's eye, and some make no bones about why they're training and favor a detailed human figure. Below, some of the best.