Serena

Serena is possibly an actress or prostitute who may be working for the United States and South Vietnamese governments. She is the only human female to appear in the game.

In-game
Nate first meets Serena when he is knocked unconscious by an artillery shell and taken to a field hospital. He awakes to see her standing over him, smiling and asking if he wants "a touch." She is then interrupted by her manager, who says that this isn't a game and that she is forbidden to use a gun. She responds by telling him that he isn't her dad and calling him "candy-ass." She then hoists Nate to his feet and tells him that they'll show everyone how "a real man defends his women folk," as NVA soldiers begin to atack.

Nate later sees her at the exit to a VC tunnel (however if a tunnel that leads to her will get blocked first, Nate will be meeted by one of American soldiers at the exit of the other tunnel instead), where she becons to him and is suddenly attacked by Infected. Despite the other soldiers attempts to save her, she is killed and left behind while the others flee to a boat.

Nate sees her again during the level Trip. She appears in the old temple as a ghost, taunting Nate and telling him he is as good as dead. The player will encounter her several times in the level before she disappears forever.

Trivia
Serena appears to be of Asian-American descent.

She speaks English with a southern accent, indicating that her teacher was from there.