Jack Ryan: President of the United States
Scott Adler: secretary of state
Mary Pat Foley: director of national intelligence
Robert “Bob” Burgess: secretary of defense
Jay Canfield: director of the Central Intelligence Agency
Dan Murray: attorney general
Arnold Van Damm: President Ryan’s chief of staff
Peter Branyon: CIA chief of station, Vilnius, Lithuania
Greg Donlin: CIA security officer
Roland Hazelton: admiral, chief of naval operations, United States Navy
Scott Hagen: commander, captain of USS James Greer (DDG-102), United States Navy
Phil Kincaid: lieutenant commander, executive officer of USS James Greer (DDG-102), United States Navy
Damon Hart: lieutenant, weapons officer on USS James Greer (DDG-102), United States Navy
Richard “Rich” Belanger: lieutenant colonel, 3rd Battalion, 5th Marine Regiment, 1st Marine Division, United States Marine Corps; battalion commander of the Black Sea Rotational Force
Gerry Hendley: director, The Campus/Hendley Associates
John Clark: director of operations
Domingo “Ding” Chavez: senior operations officer
Dominic “Dom” Caruso: operations officer
Jack Ryan, Jr.: operations officer/analyst
Gavin Biery: director of information technology
Adara Sherman: director of transportation
Valeri Volodin: president of the Russian Federation
Mikhail “Misha” Grankin: director of the Kremlin Security Council (Russian intelligence)
Arkady Diburov: chairman of the board of directors of Gazprom, Russian natural gas company
Andrei Limonov (Mr. Ivanov): Russian private equity manager
Vlad Kozlov (Mr. Popov): intelligence operative in the Kremlin Security Council
Yegor Morozov: intelligence operative in the Kremlin Security Council
Tatiana Molchanova: television newscaster, Novorossiya (Channel Seven)
Martina Jaeger: Dutch contract killer
Braam Jaeger: Dutch contract killer
Terry Walker: president and CEO of BlackHole Bitcoin Exchange, cryptocurrency trader
Kate Walker: wife of Terry Walker
Noah Walker: son of Terry and Kate Walker
Eglė Banytė: president of Lithuania
Marion Schöngarth: president of the Federal Republic of Germany
Salvatore: Italian paparazzo
Christine von Langer: former CIA case officer
Herkus Zarkus: Lithuanian fiber-optic network technician; Land Force soldier
Linus Sabonis: director, Lithuanian State Security Department
ARAS: Lithuanian police antiterrorist operations unit
ASROC: Antisubmarine rocket
ASW: Antisubmarine warfare
CIA: Central Intelligence Agency
CNO: Chief of Naval Operations
CIWS: Phalanx close-in weapons system
DIA: Defense Intelligence Agency
FSB: Federal’naya Sluzhba Bezopasnosti, Russian State Security
JSOC: Joint Special Operations Command
NATO: North Atlantic Treaty Organization
NGA: National Geospatial-Intelligence Agency
NSA: National Security Agency
ODNI: Office of the Director of National Intelligence
ONI: Office of Naval Intelligence
RAT: Remote Administration Tool
SAU: Search and Attack Unit
SIPRNet: Secret Internet Protocol Router Network — Classified network for U.S. Intelligence community
SOF: Special Operations Forces
TAC: Tactical Air Controller
TAO: Tactical Action Officer
USWE: Undersea Warfare Evaluator
VHRJTF: Very High Readiness Joint Task Force — NATO