Utter havoc reigns in the jungle after a newby makes a mistake and two other soldiers are killed going to his resuce. The men are led by Lt. Beller, and his unit has seen far too much action and too much death. Beller is an old friend of Goldman's, together they are sent back out to search for an NVA regiment. Beller tells command that his men need rest or they are going to snap but Brewster insists they must go out. Meanwhile everyone is happy to see Anderson return, except for the ever-depressed Percell. Goldman spends some time with Beller. Percell is going over the edge fast and no one knows that he has started to use drugs. Anderson discovers that Brewster is married to a Vietnamese girl and they have a child. The next day, on their mission, Percell (drugged up) starts to panic. Beller's unit creates a My Lai-type of massacre in the field and that sends Percell off the deep end and straight into the waiting arms of heroin dealers.

McKay has a date with a ""killer"" blonde but on the way to take her shopping he ends up hitting a child with his jeep and comes in contact, for the first time, with a makeshift orphanage where he decides to get involved with the orphans. Doc finds Purcell high on grass and drugs. Purcell leave in a huff, seeking more drugs, and ends up arrested and assigned to a ""shit burner"" detail. Goldman goes to Brewster to report the massacre. Later, Goldman and Anderson are briefed on a mission into Cambodia to kidnap a defecting NVA officer. Percell tries to desert.

Taylor, Ruiz and Johnson go in search of Purcell after he goes AWOL. They look for 3 days, finally being taken to a heroin parlor by three drug dealers. Danny refuses to leave and the 3 thugs won't let the soldiers force Danny out. Later, Anderson and Team Viking are trying to find a road that is part of the Ho Chi Minh trail. When they find the road they return to the base where everyone knows about Danny. Brewster tells Goldman to solve the problem and Goldman insists upon talking about the massacre. Brewster puts his own career in jeopardy as he tries to get the army to deal with Phu An massacre. Anderson (under pressure from Goldman) organizes a commando raid and goes into Cholon to spring Purcell -- who then is forced to go through cold-turkey withdrawal. Brewster is ordered to shut up about the Phu An massacre.

Anderson & Pop are having a good time at a local bar when a young trooper turns up and gets insulting to Pop -- it turns out to be Robby (Pop's son). The Phu An Board of Inquiry starts. As the situation develops and Beller realizes what his men did -- he had blocked it out -- he kills himself. Zeke and Team Viking go out with Robby on another SOG mission. They end up getting sprayed with Agent Blue. Before the end of the day, Robby ends up killed, leaving Pop to bring his son home in a body bag.