Fiction Ryan, Jack (Fictitious character) Intelligence service Prevention Ryan, Jack, Sr. (Fictitious character) Terrorism Prisoners of war Terrorists Adventure stories Crisis management in government Large type books Spy stories (Fictitious character) Aircraft carriers Armored vehicles, Military Aviation Clark, John Clark, John (Fictitious character) Imaginary wars and battles Intelligence officers Naval battle groups Presidents Special forces (Military science) Vietnam World War III World politics Aerial operations, American Americans Assassination Attempted assassination