In Call of Duty 4: Modern Warfare
Captain MacMillan, with the callsign of "Alpha Six", is a British Special Air Service officer. During the Winter of 1996, fifteen years prior to the events of Call of Duty 4: Modern Warfare, 33-year-old MacMillan was the commander of a two-man sniper team in the 22nd Regiment of the SAS which included then-Lieutenant John Price, who was assigned to assassinate future Russian Ultranationalist leader Imran Zakhaev, an arms dealer at the time. Price recalls that it was the first time the British Government had authorized an assassination order since World War II. The venue of the assassination was Pripyat, Ukraine, a once bustling town deserted ten years earlier following the Chernobyl nuclear disaster.