Building suspense involves withholding information and raising key questions that pique readers' curiosity. character development plays a big role in generating suspense; for example, if a character's desire is not fulfilled by the end of the book, the story will not feel complete for the reader.
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It appears that the author has intended to illustrate how it was back then compared to the present. The author appears to be implying that military service has lessened over time. However I do not know which essay you are reading from (you have not mentioned the name) so I am not entirely sure.
