Biometrics: Battlefield forensic identification

The Strategy Page has a brief article on how the United States' military has adopted tactics used by law enforcement, such as the collection of fingerprints, photographs, retinal scans, and DNA samples for use in identification by biometrics.  

One thing to notice in the article is the taking of photographs from multiple angles in order obtain more information than is possible from single one.  You can immediately demonstrate to yourself why it is useful to have shots from at least two angles by closing one eye while looking at someone - you immediately lose the depth information provided by your own stereoscopic vision, assuming you are normally-sighted.  This same depth information is useful in calculating biometrics for face recognition.