I agree that the use of past perfect in D is not definitively wrong. Since "Earlier in his life" clearly tells us we are talking about the period before his service in the Grant (not Grand!) administration, the past perfect is justified, even if it isn't really needed.
However, a real SC would never be two sentences. Also, you should change the last word of E, which seems to be referring to private parts(!) rather than the military.
However, a real SC would never be two sentences. Also, you should change the last word of E, which seems to be referring to private parts(!) rather than the military.
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