We can actually infer that allusions in this excerpt reinforce the meaning of the passage in the following way: The allusions recall specific locations and horrors of the Vietnam conflict.
Allusion refers to a figure of speech which is actually used to make reference to something or someone in an explicit manner. It's an indirect way making reference.
Thus, we see that "the allusions recall specific locations and horrors of the Vietnam conflict" is the correct answer.
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