U.S. Signal Corps crew filming American troops arriving in a village in Lorraine, France (1918)
Quite a number of these photographs show the U.S. Signal Corps cameramen at work on the Western Front in 1918. Thanks to research by Harry Kidd at the National Archives these pictures have been scanned and uploaded on the internet. Finally, after almost one hundred years, we can see how these official war pictures were made.
For a sample of these photographs here is a weblog showing the activities of these World War I photographers.
Weblog: Behind the Camera Lens - World War I Photographers