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I think it was more like trying to draw a collalory between the Bataan Death March & the plight of immigrants making the (often treacherous & even deadly) trek across the desert border. Not quite sure that works, though, by itself.
I get the impression that maybe that dead immigrant was the soldier's father or grandfather? Maybe.
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The Sergeant died anyway, and it was coincidental that the main character came across an immigrant dying of exposure. Symbolically, the immigrant was the main character at 18 y.o., as a part of him "died" when he watched his Sergeant get killed.