This the Vietnam war. Its the United States of American V.S Northern Vietnam. HISTORY : ..... The Southern Vietnamis were fighting the Norhern Vietnamis for freedom from commusnism. USA desided the help Southern Vietnam. Caught in the action of kill or be killed..... Over 10 million people lost there lives due this 11 year war from 1964-1975! In the end USA lost the war. The M4A1 is an M16 but stupid xilver101 hacked it.