SM-68A | HGM-25A | United States Air Force

Titan I Intercontinental Ballistic Missile

Titan I was the United States' first operational multistage ICBM and one of its first missiles deployed in hardened underground complexes. Explore the weapon, its three-silo launch installations, six operational squadrons, and the surviving record of every deployment site.

Explore all 18 complexes Follow the launch sequence
Titan I test missile launching from Cape Canaveral in 1960

A Titan I test launch at the Air Force Missile Test Center, Cape Canaveral, Florida, in 1960.

1959First Titan I flight test
1962-1965Operational alert service
54Deployed operational missiles
18Three-silo launch complexes

Explore the Titan I System

Follow the program from development and construction through underground operations, launch, deployment, and retirement.

Program SummaryWhy Titan I was developed, how it differed from Atlas, and how the national deployment program unfolded. Missile OverviewDimensions, propulsion, guidance, performance, reentry vehicle, testing, and service chronology. Development HistoryFrom the alternate ICBM studies of 1954 through Martin production and the first operational field. Building the ComplexesExcavation, reinforced structures, installation of machinery, technical acceptance, and immense construction cost. Launch SequenceCommand authentication, liquid-oxygen loading, silo doors, missile elevation, guidance, and flight. Inside a Titan I ComplexThree silos, control center, powerhouse, guidance antennas, propellant terminals, and tunnels. Plans and DiagramsTwenty-seven drawings showing the underground plan, rooms, launcher machinery, consoles, and support systems. Deployment and SquadronsThe six operational squadrons, five parent bases, alert milestones, and retirement chronology. Coordinates and Site IndexRepresentative locations for all 18 operational complexes and the principal Vandenberg test facilities.

Operational Deployment Fields

Six squadrons operated 54 missiles from 18 dispersed launch complexes associated with five Air Force bases.

These Lowry sites now have complete installation histories covering their missile mission, property transition, environmental record, and surviving features.

COTitan I Complex 724-ABennett, Colorado | 724th Strategic Missile Squadron COTitan I Complex 724-BWatkins and Aurora, Colorado | 724th Strategic Missile Squadron COTitan I Complex 724-CAurora and Bennett, Colorado | 724th Strategic Missile Squadron 18Complete Titan I Site IndexCoordinates and individual pages for every operational complex

Testing, Engineering, and the Next Titan

Titan I's operational field depended on test launches, training facilities, engineering records, and rapid development of its successor.

Vandenberg Complex 395-A

The principal Titan I silo-launch test complex helped prove the operational launch system and train missile personnel.

Explore Complex 395-A

Operational Silo Test Facility 8

OSTF-8 formed part of the Vandenberg test and training network that connected development with field operations.

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Titan II Missile System

Titan II replaced cryogenic oxygen, launched from within its silo, and remained operational long after Titan I retired.

Continue to Titan II

The First Hardened Titan

The Air Force developed Titan I as a complementary design to Atlas. Its rigid airframe and true two-stage propulsion reduced dependence on the untested features of the earliest Atlas designs, while parallel development expanded the nation's industrial and technical options. Martin built the missile near Denver, and the first operational Titan field surrounded Lowry Air Force Base.

Each squadron controlled nine missiles divided among three complexes. Every complex contained three deep silos, equipment and propellant terminals, a control center, powerhouse, two guidance antennas, utility systems, and more than 2,000 feet of connecting tunnel. The missile remained protected below ground, but crews had to load liquid oxygen and raise it to the surface before launch.

Titan I entered operational alert in 1962 and retired in 1965 as launch-from-silo Titan II and solid-fueled Minuteman forces expanded. Its short service produced some of the largest and most technically complex underground installations of the early missile age, many of which left substantial structural and environmental legacies.

Continue to the complete Titan I program summary

Historical terminology: The missile was initially designated SM-68A Titan I and became HGM-25A under the unified aerospace designation system. Titan I complexes stored three missiles, while later Titan II operational complexes normally paired one silo with one launch control center.
Titan I missile prepared for a Cape Canaveral test launch in 1959
A Titan I at Cape Canaveral on April 3, 1959, with the erector lowered before a test launch.