Thank you for your answer, stewey.
Here's the same photo with brightness/contrast adjusted:
http://img188.imageshack.us/img188/38/greatgra ndad6x4.jpg
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Thank you, poetrylover, for your answer, too.
My great-grangfather's name was John William Ward, and the photo was taken in 1941.
Finally, if you would like to exchange e-mail addresses, I could keep you informed with what I find out.