The Origins of Battlefield Photography as Military Intelligence

John Steinbeck, in his travel book, A Russian Journal (1948) has a great quote about the perception of cameras among people who have been through war:

There was some reluctance about letting a cameraman into the Soviet Union, and none about letting me in, and this seemed strange to us, for censorship can control film, but it cannot control the mind of an observer. Here we must explain something that we found to be true during our whole trip. The camera is one of the most frightening of modern weapons, particularly to people who have been in warfare, who have been bombed and shelled, for at the back of a bombing run is invariably a photograph. In back of ruined towns, and cities, and factories, there is aerial mapping, or spy mapping, usually with a camera. Therefore the camera is a feared instrument, and a man with a camera is suspected and watched wherever he goes. And if you do not believe this, try to take your Brownie-No. 4 anywhere near Oak Ridge, or the Panama Canal, or near any one of a hundred of our experimental areas. In the minds of most people today the camera is the forerunner of destruction, and it is suspected, and rightly so.