The British idea of an underground missile silo was adopted and developed by the United States for missile launch facilities for its intercontinental ballistic missiles. Most silos were based in
Colorado,
Nebraska,
North Dakota,
South Dakota,
Missouri,
Montana,
Wyoming and other western states. There were three main reasons behind this siting: reducing the flight trajectory between the United States and the Soviet Union, since the missiles would travel north over Canada and the
North Pole; increasing the flight trajectory from
SLBMs on either seaboard, giving the silos more warning time in the event of a nuclear war; and locating obvious targets as far away as possible from major population centres. They had many defense systems to keep out intruders and other defense systems to prevent destruction (see
Safeguard Program). In addition to the three previously mentioned siting reasons, the US Air Force had other site requirements that were also taken into account such as, having the sites be close enough to a populace of roughly 50,000 people for community support along with making sure launch locations were far enough apart that a 10 MT detonation on or near strategic locations would not knock out other launch facilities in the area. "In 1960 the US Army established the Corps of Engineers Ballistic Missile Construction Office (CEBMCO), an independent organization under the
Chief of Engineers, to supervise construction".
Titan facilities The
Titan I missile used a similar silo basing of the fourth Atlas version.
LGM-25C Titan II (deactivated) ICBMs were in a one
ICBM launch control center (LCC) with one LF configuration (1 × 1). Titan missiles (both I and II) were located near their command and control operations personnel. Access to the missile was through tunnels connecting the launch control center and launch facility. An example of this can be seen at the
Titan Missile Museum, located south of Tucson, Arizona. Notable accidents: • Fire in Titan II silo 373-4 –
1965 Searcy missile silo fire • Titan II explosion in silo 374-7 –
1980 Damascus Titan missile explosion Minuteman facilities , California, United States of America on 9 February 2023. The
solid fueled LGM-30 series Minuteman I, II, III, and
Peacekeeper ICBM configurations consist of one LCC that controls ten LFs (1 × 10). Five LCCs and their fifty associated LFs make up a squadron. Three squadrons make up a wing. Measures were taken such that if any one LCC was disabled, a separate LCC within the squadron would take control of its ten ICBMs. The LGM-30 LFs and LCCs are separated by several miles, connected only electronically. This distance ensures that a nuclear attack could only disable a very small number of ICBMs, leaving the rest capable of being launched immediately.
Peacekeeper facilities Dense Pack was a proposed configuration strategy for basing
LGM-118 Peacekeeper ICBMs, developed under the Reagan administration, for the purpose of maximizing their survivability in case of a surprise nuclear first-strike on their silos conducted by a hostile foreign power. According to the Dense Pack strategy, a series of ten to twelve hardened silos would be grouped closely together in a line. The idea was that to disable the Dense Pack, the enemy would have to launch many missiles, and the missiles would arrive at different times. The missiles arriving later would have to pass through the debris cloud of the first missile's explosion, damaging the follow-up missiles and limiting their effectiveness. The proposed Dense Pack initiative met with strong criticism in the media and in the government, and the idea was never implemented. File:Complesso Titan 1.jpg|Titan I missile complex. File:Cutaway Axonometric, Control Center Section, and Missile Silo Section - Titan One Missile Complex 2A, .3 miles west of 129 Road and 1.5 miles north of County Line Road, HAER CO-89 (sheet 3 of 3).png|Titan I missile complex 2A. File:Nuclear_Missile_Silo_(7332367192).jpg|Titan II ICBM in 571-7 site silo. File:Titan II launch.jpg|Titan-II ICBM silo test launch, Vandenberg Air Force Base. File:Minuteman I test silos at Edwards AFB.png|Minuteman I test silos at Edwards AFB. File:Minuteman II in silo 1980.jpg|U.S.
Minuteman II missile being worked on, in its underground silo launch facility. File:Peacekeeper missile.jpg|U.S.
Peacekeeper MX missile launches from its underground silo launch facility. File:Minuteman III ICBM Launch Control Facility November-1, 1.5 miles North of New Raymer and State Highway 14, New Raymer, Weld County, CO HAER COLO,62-NERAY.V,1- (sheet 4 of 4).png|Minuteman III ICBM Launch Control Facility November-1. File:Minuteman III in silo 1989.jpg|A Minuteman-III missile in its silo. ==Soviet Union==