My guess is it would be the negative number for the portrait photographer so he could marry up the photo with the soldier after being processed. I might also speculate that it might have been the last 4 digits of his serial number used for that purpose...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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