The location could well be Camp Dix, NJ. Another photo in this group indicates that it was taken at Camp Dix. In the opinion of a Texas A&M horticulture professor, none of the trees in the background appear to be mesquites.

Using measurements of the second shooter's rifle (from scanned photo) relative to the dimensions of my own M1903, I calculate the overall length of his rifle to be 6.5 inches longer than a standard '03 rifle. Assuming standard stock length (from triggerguard to buttstock, at least), that would make the barrel length approximately 30.5 inches.

Calculations:
My rifle: 43.375" (overall length) and 14" (top corner of buttstock to middle of bolt handle base)
Shooter #2's rifle: 228 mm (overall length) and 64 mm (top corner of buttstock to middle of bolt handle base)
Shooter #2's rifle overall length = (14/64)(228) = 49.875"
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