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.

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.