On October 8, 2013, a joint Task Force 141/Delta Force operation codenamed Operation Kingfish was launched; the team consisting of John Price, John "Soap" MacTavish, Simon "Ghost" Riley, Gary "Roach" Sanderson, and Delta Operators Sandman and Derek "Frost" Westbrook.

Thorfinn, the oldest ghost, is a Viking who died around the 1020s.