The U.S. soldiers most frequently encountered enemies fighting for the __________.

Check this out,

http://www.gradesaver.com/if-i-die-in-a-combat-zone/q-and-a/obrien-is-removed-from-the-front-lines-when-what-happens-to-him-also-who-do-the-us-soldiers-most-frequently-encounter-as-enemies-98335/

Thank you Aslan.

I read this before but I am not sure whether it should be land mines or , every sullen, antagonistic, anti-American Vietnamese they see; villagers--old men, women, children, water buffalo, everything Vietnamese or all of them.

Could you please advise your opinion?

Thanks again!

Viet Cong