The VC are mauling the American soldiers through their use of the underground tunnels. On their latest trip into the bush, Anderson and the men provide a blocking force, only the Gooks being driven toward them disappear down into the tunnels... and Goldman and Anderson end up firing on Americans -- thinking they are VC coming toward them. The team ends up in a village but again gets attacked as the VC pop up out the tunnels and then back into them after the attack. Taylor is captured during this fighting -- having been wounded. Taylor ends up being befriended by a VC Doc who has no interest in fighting -- only in returning home alive. On the surface, Anderson and Goldman go into the tunnels, only to end up entombed by a cave-in.

Anderson, Baker, and Johnson are shot down while catching a ride in a helicopter, which explodes just after it hits the ground. They are unhurt but the pilot is dead, and VC soldiers are firing at their position. Zeke manages to kill all of the VC but one, who escapes. With the fighting over for the present, they begin the long trek back to base, all the while being hunted by the VC. The enemy group is led by Trang, a man who wants to kill the Americans for revenge. The three Americans stumble upon a village of Montagnards who have been wiped out, all but a pregnant woman who is dying... and does just as the child is born. Anderson is adamant about leaving the baby behind, but Johnson and Baker consider that move barbaric. Anderson ends up taking care of the baby and forming the strongest bond. Meanwhile, Goldman is out looking for Zeke and the others. Back in the jungle, Anderson risks his life to get milk for the baby and keeps the child from being killed. In a heated exchange of gun

Baker insists his fellow squad members follow him to an incoming helicopter. The incoming ""VIP"" turns out to be Baker's twin brother, who brings along a skate board that the whole squad uses for fun. Carl Baker turns out to be nothing like his brother: he is hard-drinking, womanizing, party-goer. The two brothers end up in a fight, nearly destroying the base in the process. Carl celebrates their birthdays by bringing in a truck-load full of Vietnamese hookers. They all party down and, in the end, Baker ends up doubly-mad as his brother ""steals"" his girl. Carl leaves the next morning with neither brother on speaking terms and everyone in trouble. Carl's helicopter goes down and Baker goes in after him, managing to get caught by the same VC who have his brother. They are both tortured by the VC and Anderson and Goldman must go in to rescue the two.