During the vietnam war, us troops had the advantage of
a. college deferments.
b. access to chinese military resources.
c. superior geographic knowledge of the region.
d. superior firepower.

D. superior firepower

Explanation:

superior firepower ( D )

Explanation:

during the Vietnam War, US troops had a superior firepower when compared to the firepower of the Vietnamese troops and that was a very big advantage because having a superior Firepower meant that you could sustain a battle as long as necessary. what they lacked in the Geographic knowledge of the the region that the Vietnamese troops had,was compensated for by having a superior Firepower.

This was the major advantage the US troops had over the Vietnamese troops

i think it was   tsar alexander ii