The statement which best describes the effect of the parallelism in this excerpt is,
The parallel structure of these lines emphasizes that the pilot does not have much emotion for his enemies or his countrymen.
This refers to the use of similar structures in a text which denotes the usage of phrases, verbs, words, etc. in a given paragraph.
Based on the given text, we can see that parallelism is used by the author to make emphasis on how he does not have emotion for his fellow countrymen as he is neutral.
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