Another possibility is Arthur Alexander Gray, the Ambassador to Vietnam who bribes an interpreter to attempt to hide how close Sarkhan is from falling into Communist hands.  
One of this novel's characters is severely beaten and left naked on the steps of the embassy with a note pinned to his chest stating he had raped a native woman.  He is being framed for the alleged crime, but he is simply a former OSS officer not the unsavory title character.  The title character is more likely Louis Sears, who refuses to heed Colvin's advice.  Another possibility is Arthur Alexander Gray, the Ambassador to Vietnam who bribes an interpreter to attempt to hide how close Sarkhan is from falling into Communist hands.  FTP, name this title character of a novel by William Lederer and Eugene Burdick whose name is now used to describe any US citizen who makes an ass of himself while abroad.
One of this novel's characters is severely beaten and left naked on the steps of the embassy with a note pinned to his chest stating he had raped a native woman.  
The Ugly American